Miyabi Birchwood 9" Sharpening SteelG2 micro-carbide powder steelAuthentic thin Japanese blade profileHand-honed using the three-step Honbazuke process to a 9.5 to 12 degree edgeCRYODUR blade, ice-hardened to Rockwell 63101-layer flower Damascus design with katana edgeTraditional Japanese Karelian (Masur) Birch handleRounded spine and heel