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Yeah they don't look like they're doing much but they can put on one hell of an edge. I don't use the factory lapped surface though, lapped one side of mine finer. Great shaves but the edge needs to...

I got it from a friend. It's not solid BC, but BC grit in some other binder. I think they are sold on eBay too. The one I have is a combo - 400/1000. I'm not sure how high a grit they offer.

Yep, good stuff. Boron carbide is IIRC the 3rd hardest substance, behind diamond and CBN. I recently got a BC bench stone but haven't messed with it much yet.

They finish a razor very well in my experience, very keen edge. It's a little harsher edge than a coticule though, for sure. The "curved lines" you see when there's a little bit of swarf embedded in...