KASUMI Hammer design (H.M.) knives are developed by combining the best technologies from over a decade of experience in producing KASUMI H.M. series knives. KASUMI H.M. knives are hand made utilizing the skills of knife making specialists and crafted in the same fashion as traditional Japanese swords. The main cutting blade of a KASUMI H.M. knife is made of Japanese VG-10 Cobalt high carbon stainless steel that has been developed especially for knives. The blades are hardened to Rockwell C59-60 degrees; the ideal hardness for quality professional kitchen knives. This provides the sharpest cutting edge possible that lasts longer than most other knives.