The Japanese Feather Artist Club SS straight razors, either folding or non-folding, uses 50 mm (2 inch) very sharp replaceable blades. I learned to straight shave using the Feather Artist Club SS non-folding razor. The Feather razor blades are famous for their sharpness that give close shaves for the entire face, even if you have a beard. I enjoyed using the non-folding razor because the straight handle combined with the 2 inch blade allowed more user friendly hand positions than folding razors but both types have 2 inch blades. The Feather Artist Club razor is still in my rotation.