Blade Sharpness Research Project

[T Bone]

I found the alignment of subjective reviews with data very surprising at first, but I am getting used to the idea. My first instinct isn't to trust the memory and subjective impressions of humans.

I'd take a single user's review of a blade with a huge grain of salt for that reason. Even a few users, since there's going to be a selection bias in who replies to a review, and some confirmation bias as well. But most of the popular blades, there's quite a consensus that's developed over time. Pretty much everyone who's tried a Feather agrees it's a sharp blade, even if they didn't like it.

Are you measuring the thickness of the blades when you do this? The reason I am asking is if you did and you measured the bevel width you could get the bevel angle as well.

Would that work if there's 2 bevels though?

 

[blethenstrom]

Would that work if there's 2 bevels though?

Two bevels would make it hard to measure I agree 100%. Not sure how you would measure those. I probably spoke to quickly.

 

[PALORAZOR]

Yes, but no. The Personna comfort coated blades are still being made, but this particular blade came from a box with a 2013 manufacture date, back when Energizer still owned the brand. The current blades are made in the same factory, and they are still a great blade, but to my face the older Energizer era blades felt significantly smoother.

Will be scouring eBay for some!

 

[Alex Jr]

Wow, what a great thread! Thank you for such detailed information and testing.

If I understand correctly, BIC wasn’t rated at feather level sharpness from the second shave on, like another site previously measured. Could that be from batch variation?

May I leave some suggestions for future analysis?

Astra SS (maybe Russia vs India?)
Derby extra
Treet platinum
Lord platinum
Tiger platinum (scratchy and harsh blade for me)

Again, great thread!

 

[PALORAZOR]

I just found some vintage Merkur blades I bought probably 15 years ago. Would be an interesting test.

 

[helicopter]

I am not measuring thickness because I found that most blades are 0.10mm thick on my calipers. I just checked a bunch, and some of them are 0.11mm as well. You could probably scale the uncropped microscopic images without much trouble at all, since I have been taking all of them at the same magnification. All you would need to do is take a picture of a known object and scale it. I would want to get some micrometers to get to 0.001mm on the thickness if I were going to attempt it. And as mentioned above, a secondary bevel doesn't work out very well. Even if you could do the geometry, a lot of the double beveled blades have a jagged transition between the bevels.

 

[Dimitri]

Will be scouring eBay for some!

There's a seller on Amazon advertising Personnas for sale and showing pictures of the old packaging. It could be that he's selling the current ones but hasn't changed the pics. They are not available as a "prime" item though. Still, the seller might be worth contacting.

 

[Dimitri]

I just found some vintage Merkur blades I bought probably 15 years ago. Would be an interesting test.

That would be interesting. I know current Mekur blades tend to get bashed quite a bit, but when I purchased a Merkur Futur ~15 years ago, the razor came with a tuck of blades and I remember them being decently sharp and very smooth. Not too dissimilar to the older Personna @helicopter just tested.

 

[helicopter]

That would be interesting. I know current Mekur blades tend to get bashed quite a bit, but when I purchased a Merkur Futur ~15 years ago, the razor came with a tuck of blades and I remember them being decently sharp and very smooth. Not too dissimilar to the older Personna @helicopter just tested.

I have at least one Merkur here I could test. I didn't really love the one I tried, and certainly wouldn't stock up on it at its price. I like the current issue Feather and Personna way better, if I am going to get a new blade from a high cost location.

The post-test Energizer Personna did produce a comfortable and clean shave. I am not going to scour the internet for more of them, though; I am quite happy with the new one.

 

[Dimitri]

I have at least one Merkur here I could test. I didn't really love the one I tried, and certainly wouldn't stock up on it at its price. I like the current issue Feather and Personna way better, if I am going to get a new blade from a high cost location.

The post-test Energizer Personna did produce a comfortable and clean shave. I am not going to scour the internet for more of them, though; I am quite happy with the new one.

Same here with regard to the current Personnas. I recently purchased a box with a "bonus" of 20 extra blades for a total of 120. Between those and a recently purchased 100 pac of bics, I think I'm set for the next several years.

I am really surprised though to find that the current Personnas are second only to the Feathers in sharpness. I find Feathers harsh and irritating to my skin but the Personnas to be really smooth. I think it just goes to show what a difference those PTFE and other coatings can make for some people. That said, it's probably been 20 years since I last tried a feather. My face is more leather than baby butt these days, so I may have to give them a whirl again sometime.

 

[blethenstrom]

I am not measuring thickness because I found that most blades are 0.10mm thick on my calipers. I just checked a bunch, and some of them are 0.11mm as well. You could probably scale the uncropped microscopic images without much trouble at all, since I have been taking all of them at the same magnification. All you would need to do is take a picture of a known object and scale it. I would want to get some micrometers to get to 0.001mm on the thickness if I were going to attempt it. And as mentioned above, a secondary bevel doesn't work out very well. Even if you could do the geometry, a lot of the double beveled blades have a jagged transition between the bevels.

You could use a 0.01mm microscope camera calibration slide (stage micrometer) for the bevel length measurement. They are very affordable and you just put them in the view with what you want to measure under your microscope.

Yes for thickness you do need a micrometer. A caliper would not be accurate enough.

Indeed there are several limitations regarding this and some are more difficult to deal with than others. Secondary bevel and rough bevels certainly is difficult to deal with. I do not want to add to your work load regarding this. No need to worry about it.

 

[helicopter]

Wow, what a great thread! Thank you for such detailed information and testing.

If I understand correctly, BIC wasn’t rated at feather level sharpness from the second shave on, like another site previously measured. Could that be from batch variation?

May I leave some suggestions for future analysis?

Astra SS (maybe Russia vs India?)
Derby extra
Treet platinum
Lord platinum
Tiger platinum (scratchy and harsh blade for me)

Again, great thread!

I measured the Russian one when I was developing my protocol for the PT50A tester. It was nothing special compared to the Indian one; not quite as sharp. I couldn't really tell a difference shaving with them. They are similar enough that many blades show bigger differences between batches, and some show bigger difference between the two edges. I will probably do it again at some point to get it back on the chart, but I want to prioritize blades that are still in production for now. I feel I have already looked closely enough to determine there is no need to run out and stock up on the Russian one before supplies dry up. The Indian one is fine.

 

[PALORAZOR]

I have at least one Merkur here I could test. I didn't really love the one I tried, and certainly wouldn't stock up on it at its price. I like the current issue Feather and Personna way better, if I am going to get a new blade from a high cost location.

The post-test Energizer Personna did produce a comfortable and clean shave. I am not going to scour the internet for more of them, though; I am quite happy with the new one.

I just shaved with the vintage Merkur on the R41. 2 passes, good but not great. Not as smooth as the Treet Dura Sharp but that might be because I hadn’t worn through the coating on the Treet. Might be a bit too sharp for an aggressive razor.

 

[Alex Jr]

I measured the Russian one when I was developing my protocol for the PT50A tester.

The SS (blue)? Oh, I have to go back to page one, I may have missed something

The SS (blue) is one of my favorite blades.

 

[helicopter]

The SS (blue)? Oh, I have to go back to page one, I may have missed something

The SS (blue) is one of my favorite blades.

I have some Russian Nov 2022 production ones, but I should get the new Indian one and test it first. RBC has it.

 

[Alex Jr]

I have some Russian Nov 2022 production ones, but I should get the new Indian one and test it first. RBC has it.

Wonderful! I’ll keep an eye on the thread.

 

[helicopter]

I measured the widely available Van Der Hagen Basics super stainless blade today. It looks better on the chart than it actually is, due to having a variance between its two edges. One of the edges was quite dull, but durable and consistent. The other edge, was less dull, but also less durable and consistent. Overall it seems better than the other dull blades I have tested, and it has a finely ground bevel that looks smooth under a microscope. It might be a good blade for a beginner since it won't dive into the skin like a sharper blade, and it is more consistent and durable than other dull blades.

It has nice packaging; perfect, really. Parchment under glossy printed paper and a glossy tuck with ten blades in it.

The edge looks very nice. It is finely and evenly ground and deeply honed. The coating is reasonably even and applied to only the distal part of the bevel.

After testing, it has typical very fine chipping, but looks above average overall. The good condition probably has more to do with the gentle blade geometry than it does with great steel, but the chipping is fine so the steel is probably decent. This blade might last a long time if you don't mind dullness.

Information Summary:

Date	7/17/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Van Der Hagen	Basics	Super Stainless	China	~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push
Measurements	30	30	30	30	30
Std. Dev.	18	14	15	14	14
Median F (g)	94	92.5	94	99	107
Mean F (g) Btm	100	97	95	99	102
Mean F (g) Top	82	89	97	102	107
Mean F (g)	91	93	96	101	104
BESS Adj. Factor	0.83	0.83	0.83	0.83	0.83
Av. Adj. F (g) Bt	83	80	79	82	85
Av. Adj. F (g) Top	68	74	80	85	89
Median adj. F (g)	78	77	78	82	89
Mean adj. F (g)	76	77	80	84	87

Complete Data:

Date	7/17/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Van Der Hagen	Basics	Super Stainless	China	~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push
Measurements	30	30	30	30	30
Std. Dev.	18	14	15	14	14
Median F (g)	94	92.5	94	99	107
Mean F (g) Btm	100	97	95	99	102
Mean F (g) Top	82	89	97	102	107
Mean F (g)	91	93	96	101	104
F (g) 1	97	104	90	82	100
F (g) 2	94	109	88	109	91
F (g) 3	91	111	90	90	95
F (g) 4	99	81	103	104	113
F (g) 5	94	87	104	100	91
F (g) 6	117	84	121	94	77
F (g) 7	110	107	94	93	115
F (g) 8	69	91	90	86	112
F (g) 9	94	110	109	100	88
F (g) 10	95	93	71	121	86
F (g) 11	94	114	78	91	108
F (g) 12	102	92	111	107	102
F (g) 13	118	91	85	111	142
F (g) 14	104	94	102	114	100
F (g) 15	128	84	94	81	107
F (g) 16	90	59	97	124	112
F (g) 17	107	85	94	124	88
F (g) 18	63	81	89	106	123
F (g) 19	87	115	85	87	109
F (g) 20	76	71	122	82	88
F (g) 21	85	79	96	81	111
F (g) 22	65	69	119	115	118
F (g) 23	93	89	68	111	117
F (g) 24	103	96	117	98	110
F (g) 25	77	94	109	98	107
F (g) 26	70	117	79	92	101
F (g) 27	78	96	90	118	87
F (g) 28	111	82	117	97	122
F (g) 29	46	95	103	117	101
F (g) 30	75	102	69	87	113

I don't really like it when there is an important difference in performance between the top and bottom edges of a blade, but if you need to get some blades and this is the only one available, or you have some because they came with a razor, it isn't a terrible blade and it may give you a chance to try a blade that isn't too sharp.

 

[helicopter]

This afternoon, we have the Gutche blade from China. This blade has a foil "net" over the edge that is supposed to protect your skin from it. I think it actually does work, but not very well, and that the blade itself is remarkably dull. It can't be pushed through paper at normal forces, because the protective net isn't sharp. I ended up slicing the paper. It was like a saw going through it. I don't know if this worked, but it doesn't really matter. This is not a blade I would take seriously. Although I am not set up to measure it properly, because it hits the dull spots and slides onto the sharp spots, there isn't a subset of points on the blade that is reasonably sharp anyway. I suspect the main feature of this blade is a wide and dull bevel, and the foil net is a secondary feature. I did shave with it, and it produced a DFS with no irritation in about 6 passes using a Rex Sentry slant. I didn't know it was possible to end up without a raw BBS face doing 6 passes with the Sentry, but it is.

It comes in a tuck of ten blades. Since the edge is already protected, it doesn't need waxed paper. So, they just fold it up in fiber paper, badly. It doesn't really matter though.

Look at this! It really is like the pictures in the ad on Ali Express! I think there is a vintage blade of similar construction, but I think I threw it out a long time ago.

Zoomed out to show this.

Closer:

Crazy. The bevel itself looks alright. Super shallow grind. Even scratches, lots of honing, and even coating.

After testing, the coating is partly gone, and it is smoothed a bit. It doesn't seem to have worn much, so the net is doing what it is supposed to do.

Information Summary:

Date	7/17/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Gutche	Super Stainless	6Cr13	China	~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Paper slice inches	Paper slice inches	Paper slice inches	Paper slice inches
Measurements	30	30	30	30	30
Std. Dev.	45	46	36	41	40
Median F (g)	125	130.5	134	138	148
Mean F (g) Btm	139	158	143	145	152
Mean F (g) Top	138	129	139	153	152
Mean F (g)	138	143	141	149	152
BESS Adj. Factor	0.83	0.83	0.83	0.83	0.83
Av. Adj. F (g) Bt	115	131	119	120	126
Av. Adj. F (g) Top	114	107	116	127	126
Median adj. F (g)	104	108	111	115	123
Mean adj. F (g)	115	119	117	123	126

Complete Data:

Date	7/17/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Gutche	Super Stainless	6Cr13	China	~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Paper slice inches	Paper slice inches	Paper slice inches	Paper slice inches
Measurements	30	30	30	30	30
Std. Dev.	45	46	36	41	40
Median F (g)	125	130.5	134	138	148
Mean F (g) Btm	139	158	143	145	152
Mean F (g) Top	138	129	139	153	152
Mean F (g)	138	143	141	149	152
F (g) 1	125	228	234	120	158
F (g) 2	127	131	137	168	127
F (g) 3	128	152	120	132	122
F (g) 4	125	179	105	145	112
F (g) 5	115	120	136	120	210
F (g) 6	209	112	133	208	154
F (g) 7	136	89	153	138	120
F (g) 8	233	127	115	114	92
F (g) 9	138	206	108	109	216
F (g) 10	143	217	147	138	141
F (g) 11	112	223	120	210	142
F (g) 12	151	225	133	143	172
F (g) 13	114	148	135	143	232
F (g) 14	103	114	147	137	154
F (g) 15	120	103	218	144	122
F (g) 16	99	108	95	192	106
F (g) 17	218	96	106	134	213
F (g) 18	89	156	108	213	163
F (g) 19	179	138	158	100	115
F (g) 20	111	135	190	101	156
F (g) 21	214	90	133	222	108
F (g) 22	97	101	149	221	88
F (g) 23	228	208	125	128	129
F (g) 24	79	94	146	117	133
F (g) 25	191	212	91	154	206
F (g) 26	108	107	118	166	140
F (g) 27	83	109	190	228	156
F (g) 28	156	107	156	123	169
F (g) 29	107	139	111	88	204
F (g) 30	109	130	215	101	197

Take these measurements with a grain of salt. The comparability of this data to other blades tested is somewhat poor. I am leaving it on the chart, though. Those dull spots were there and I measured them. No way the slicing damaged the blade more than the push test did other blades, so I don't think its unfair, it is just a different animal.

 

[helicopter]

This evening, we have another Chinese blade, the Jifuli Platinum Edge Stainless Steel blade GF-4395 from Baolai Razor Co. Ltd. This blade is below average in almost every way, without being terrible in any way. It is somewhat dull, somewhat inconsistent, chips more than other blades when it fails, but might be acceptable for a while if you don't need a sharp blade and aren't too picky. It isn't a good value when Flydear is available. It comes in a nice tuck of ten blades. The individual blades are marked "10 pieces" because they recycled the graphics from the tuck. The blade is double wrapped, but the outer paper is thin, neither paper is coated, and there are no wax dots.

It looks acceptable under a microscope. The primary bevel has some small scratches and some big ones, like they used inconsistent abrasives to grind it. There are even some grinding scratches up on the side of the blade. The honing looks deep and even. The coating looks thin and a little uneven. Nothing good; nothing terrible. I think I forgot the 2x digital zoom on this one.

On the finished blade, there is some heavy chipping. This steel isn't durable, but it made it through two paper cuts alright. You can see the scratches proximal to the bevel better in this photo. Those were there when the blade was new; It is just a different location from the other picture.

Information Summary:

Date	7/17/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Jifuli	Platinum Edge	Stainless	Baolai GF-4395	~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push
Measurements	30	30	30	30	30
Std. Dev.	11	12	15	13	13
Median F (g)	83	89.5	84.5	101.5	106.5
Mean F (g) Btm	82	91	93	99	111
Mean F (g) Top	81	87	87	101	100
Mean F (g)	81	89	90	100	105
BESS Adj. Factor	0.83	0.83	0.83	0.83	0.83
Av. Adj. F (g) Bt	68	76	77	83	92
Av. Adj. F (g) Top	67	72	72	84	83
Median adj. F (g)	69	74	70	84	88
Mean adj. F (g)	68	74	74	83	87

Complete Data:

Date	7/17/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Jifuli	Platinum Edge	Stainless	Baolai GF-4395	~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push
Measurements	30	30	30	30	30
Std. Dev.	11	12	15	13	13
Median F (g)	83	89.5	84.5	101.5	106.5
Mean F (g) Btm	82	91	93	99	111
Mean F (g) Top	81	87	87	101	100
Mean F (g)	81	89	90	100	105
F (g) 1	89	98	85	90	99
F (g) 2	89	88	104	135	109
F (g) 3	83	80	84	92	110
F (g) 4	90	113	80	110	108
F (g) 5	78	102	113	98	105
F (g) 6	81	75	96	105	108
F (g) 7	85	117	105	104	134
F (g) 8	105	73	97	96	127
F (g) 9	89	112	91	89	105
F (g) 10	71	82	103	105	111
F (g) 11	86	89	60	89	102
F (g) 12	64	67	113	78	89
F (g) 13	76	84	81	106	115
F (g) 14	89	97	92	102	118
F (g) 15	48	92	84	92	122
F (g) 16	69	74	79	93	105
F (g) 17	77	89	73	84	119
F (g) 18	71	66	81	82	103
F (g) 19	75	90	73	86	88
F (g) 20	88	92	83	113	90
F (g) 21	80	76	71	109	111
F (g) 22	91	91	106	109	87
F (g) 23	83	82	83	86	108
F (g) 24	88	98	88	118	91
F (g) 25	79	90	110	103	114
F (g) 26	76	89	82	109	100
F (g) 27	88	93	72	114	79
F (g) 28	95	92	103	89	101
F (g) 29	85	89	116	101	112
F (g) 30	72	91	78	121	85

I was hoping this blade would be better, but if you already have it, it might be acceptable.

 

[helicopter]

Today, I measured the Derby Extra Super Stainless green blade. It is not very sharp, but nicely honed and quite durable and consistent. It comes in one of those plastic tucks. The blades are wrapped in a single piece of waxed paper with some wax to keep them centered.

The description of this coating is elaborate: "Chromium-Ceramic Platinum Tungsten Polymer."

The blade looks nice under a microscope. It has a moderately even grind on the primary bevel and a finely honed secondary bevel. It looks smooth. It has a thin and even coating.

After testing, the bevels are smoothed out, the coating is gone, and there are some dents along the apex. This is one of the relatively resilient edges that doesn't chip as much as most razor blades.

Information Summary:

Date	7/20/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Derby Extra	Super Stainless	Cr-cer-Pt-W-poly		~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push
Measurements	30	30	30	30	30
Std. Dev.	10	9	7	12	7
Median F (g)	85.5	85	98	103	102
Mean F (g) Btm	94	85	98	102	103
Mean F (g) Top	81	82	98	103	105
Mean F (g)	87	84	98	102	104
BESS Adj. Factor	0.83	0.83	0.83	0.83	0.83
Av. Adj. F (g) Bt	78	71	81	84	86
Av. Adj. F (g) Top	67	68	81	86	87
Median adj. F (g)	71	71	81	86	85
Mean adj. F (g)	73	70	81	85	87

Complete Data:

Date	7/20/24	7/17/24	7/17/24	7/17/24	7/17/24
Blade	Derby Extra	Super Stainless	Cr-cer-Pt-W-poly		~2023
Shaves	0	P3	P6	P9	P12
Location	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top	Bottom/Top
Medium	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29	Stren 8 .29
Dulling Substrate	New	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push	Stpl Ppr Rubr Push
Measurements	30	30	30	30	30
Std. Dev.	10	9	7	12	7
Median F (g)	85.5	85	98	103	102
Mean F (g) Btm	94	85	98	102	103
Mean F (g) Top	81	82	98	103	105
Mean F (g)	87	84	98	102	104
F (g) 1	98	85	92	121	95
F (g) 2	96	76	93	107	100
F (g) 3	84	87	95	100	101
F (g) 4	95	87	100	103	95
F (g) 5	98	89	96	98	102
F (g) 6	96	75	97	93	102
F (g) 7	102	75	106	93	108
F (g) 8	101	93	105	91	105
F (g) 9	96	79	100	110	100
F (g) 10	103	91	104	92	101
F (g) 11	79	99	91	98	106
F (g) 12	85	93	98	103	101
F (g) 13	88	79	87	94	103
F (g) 14	101	66	103	128	114
F (g) 15	86	108	96	92	118
F (g) 16	93	84	108	105	100
F (g) 17	81	65	92	101	106
F (g) 18	80	84	98	80	103
F (g) 19	73	80	90	81	96
F (g) 20	79	85	92	109	97
F (g) 21	91	94	101	114	99
F (g) 22	85	85	108	104	110
F (g) 23	84	81	105	95	101
F (g) 24	90	75	85	116	120
F (g) 25	82	90	84	126	117
F (g) 26	76	74	98	107	99
F (g) 27	75	86	92	105	97
F (g) 28	72	70	98	105	110
F (g) 29	80	88	113	109	120
F (g) 30	75	88	102	88	105

If you like blades that are smooth and not especially sharp, I recommend trying this one, along with the Chinese Van Der Hagen Basics blade. They are quite similar in terms of sharpness and durability, though this one is double-beveled, so it might feel smoother.