They work for me in all my razors
In my experience the blacks a quite a bitI personally think the Black 7 O’clocks are sharper.
i have shave extensively with all those. i found the personna blue (usa) milder and longer lastingThis is my second week and second blade. Not as sharp or as durable as the Personna Red, but smoother. For someone seeking a low irritation blade, this might be the one.
i have shave extensively with all those. i found the personna blue (usa) milder and longer lasting
I will say, so far, I think I prefer the Platinum Lux to the Swedish Supersteel both from Rapira. The Platinum Lux seemed to be a nice combo of sharp and smooth.