Konosuke SKD Tsuchime series. This Konosuke Tsuchime (roughly translates to hammered) line of knives are san mai constructed with SKD Tool steel on the core and wrapped with softer stainless to provide protection from rust. These are excellent knives for those looking for a great performing knife with excellent hardness at HRC 64-65 and a long lasting edge. The knife has a really nice rosewood octagonal handle with buffalo horn ferrule. Will take a great edge and hold it through lots of use.