Seriously doubt it, Mühle/EJ are the only ones with the STF Knot. IIRC they developed them on their own so not likely to outsource them.I really like the Duca and Veteran.
I hope they use the STF fiber, from the pictures it looks the same.
I have this knot from TurnNShave. It has plenty of backbone and makes thick leather but tips feel and knot behave like not broken in badger with skritchy tipsIt's apparently a type of knot on its own. TurnNshave sells the knot ($10), as well as complete brushes.
Silver Synth (aka SilverSynthetic)
The Silver Synth shave brush knot resembles the original Ubersoft knot but it captures the look of 3 band silvertip knot. The backbone is medium and the tops are on the “border” of soft and plush. This knot can feel springy, but when it’s wet the backbone feels like a natural fiber brush. This brush excels at lather flowthrough. “Painting” your lather with this brush works well.
TYPES OF SYNTHETIC KNOTS:
Plisson - Super Plush Type
This knot first of the "modern synthetic era" made its appearance in the Plisson Brush. This knot became famous because it was the first “recent” synthetic knot that offered a noticeable improvement in performance, rivaling animal hair. This knot is still very popular and is still offered by many brush makers. It goes by many names but probably has “Pliss” in the name.
Ubersoft (1 & 2 & 3)
The Ubersoft knot was the first synthetic offering that provided soft tips with a strong backbone. For those that enjoy the backbone found in 2 band badger or boar, this was the synthetic equal. It was later offered in a Version 2 in a fan shape. The fan shape gave it a better splay and made it excellent for face lathering. As the name suggests this is a very soft brush that also hold its shape. Considered by many to be the best knot (synthetic or natural) on the market.
Tuxedo - Black Wolf - Black Tie - Luxedo
The Tuxedo has become a popular synthetic knot for its unusual appearance. It has super soft tips and medium backbone. The fibers are black with white tips. This knot has natural splay and is not as springy as some synthetic knots. With this synthetic knot, Some recommend not getting a high-density version of this knot. Many consider the Tuxedo knot shave brush the Goldilocks knot of the synthetic world--It’s just right across the board.
The Timberwolf synthetic shave brush knot introduced a new level of just how soft synthetic shave brush tips can get--it is often described as “Plush.” If you want to know what “plush” feels like, think of how your wife’s makeup brushes feel. Backbone is low-mid. This knot is grey with black tips. Because the fibers are a tad thinner, there are more in this knot compared to other synthetic brushes. Because of that, it won't have as great flow through.
Silksmoke - Hawk
This knot is gray with white tips. It has even softer tips than the Timberwolf. The biggest difference is this knot has a strong backbone. When you feel the knot dry, you could easily think that this knot may have too much backbone. The backbone can feel springy, but when wet the backbone on this knot is very pleasant. With most other plush knots, the fibers are thinner. The Silksmoke synthetic shave brush gets the backbone from the density. It has mid grade flow through but the nice scrub from this knot makes it shine.
Synbad - Mew
The Synbad synthetic shave brush knot is a brown knot with white light cream tips. The fibers are thicker than the average synthetic knot so that will be the main source of the backbone. The backbone is low-medium. This reminds some of a 3 band silver tip with just more backbone.
Cashmere - Angel
This knot may be the most underappreciated Synthetic knot out there at the moment. The Cashmere synthetic shave brush knot has plush tips and is a lighter shade of beige. While it's not the most aesthetically pleasing knot to look at, this brush is a powerhouse. This brush receives high marks all across the board as is our second choice behind the Ubersoft. There is little to no backbone on this knot: if backbone is important to you, pass on this type unless you can find one with a deeply-set loft. This brush has the nicest flow through of any knot out there.
This knot is a darker brown. And it is the equivalent of its natural fiber counterpart. Unlike the actual Horse fiber the Faux Horse synthetic shave brush knot these fibers don't tangle, so there is no need to comb the fibers after every shave. The backbone is low and you can still feel a springiness to it. There comes a point where a lot of the synthetic knots feel the same, and the only thing that is different is the actual color of the fibers. This one happens to be one of those.
Gamechanger - Boss
The Gamechanger knot was introduced shortly after the Tuxedo knot. The color of the knot is a darker Gray with black soft tips. While it's not the best-looking knot, can be a solid “daily driver.” The Gamechanger synthetic shave brush knot has the backbone most want with the soft tips with great scrub.
The Ghost knot is about 90% the Gamechanger knot, just white. Because the fibers are all white, you can see some of the fibers can be a bit wavy. This is where the back comes from in this knot.
The Silver Synth shave brush knot resembles the original Ubersoft knot but it captures the look of 3 band silvertip knot. The backbone is medium and the tops are on the “border” of soft and plush. This knot can feel springy, but when it’s wet the backbone feels like a natural fiber brush. This brush excels at lather flowthrough. “Painting” your lather with this brush work well.
The Full moon knot is nearly identical to the silver synth knot with just more of a balloon bulb shape. The fiber is a bit thicker and the tips cross into the plush category. This knot is great for both bowl and face lathering.
When the motherlode knot first came on the scene, the color was a big turn off to most. It has a dark maroon brown color with off white tips. This knot has the thinnest fiber but also the plushest tips available. Because these knots were extremely dense and the fibers were really thin, finding the right loft is important to get super plush tips and a different kind of backbone that can not be found in any other knot. Set this knot 2-4mm deeper for the best result.