132 layers surrounding an MC66 powder steel core. Meets the exacting requirements of exceptional sharpness, stability and cutting edge retention. The MIYABI 5000MCD 67 series is a stunning example of the finest Japanese craftmanship. The knife features an ice-hardened, 66 HRC hardness powder steel core blade surrounded by 132 layers of steel. - CRYODUR® ice-hardened blade at -196C for extreme hardness and corrosion resistance - 66 HRC hardness for exceptional sharpness and edge retention - 132 layers create the flower Damascus design of the blade - Symmetrically honed cutting edge - Traditional D-shaped handle of Black Ash wood