Shimomura-kogyo Tsunouma Usuba Knife 165mm (TU-9002) Length: 290mm / Blade length: 165mm / Thickness: 2.0mm Blade material: stainless steel superalloy / molybdenum-vanadium steel Cutting edge hardness: HRC57 plus or minus 2 Pattern charge: stop tack and tack back three percent this through, strengthening black wood flat pattern, this one with ferrule