I was in Tokyo last week and decided to pick up some Feathers. In addition to the well-known hi-stainless/platinum ones, I found packs of carbon steel blades at half the price (248 yen vs. 525 yen for ten). Black, with no markings whatever. Like a fool, I bought five packs before trying them out. Folks - they are the worst, dullest I have ever encountered - completely unusable. I can't imagine why anyone would shave with these. Maybe they are meant to be used for something else.