"AO-TSUBAME" Paring Knife 150mm, Blade Edge : Aogami Super Steel, Double Bevel (Petty Knife) Blade Length : about 150mm(5.9inch), Whole Length : about 255mm(10.0inch), Weight : about 73g(2.6oz), thickness 1.6mm(0.06inch), HRC about 66-67 Blade Edge : Aogami Super Sandwitched by Stainless Steel 3-layer material , Hardness : around HRC64 +/- 1. Double Bevel, Available for both Right and Left Hander. Made in Japan! HRC Approx. 66-67 The sharpness lasts long. Hardness is very high, and sharpening is difficult .