D2, AUS-8 or 420 HC
Kizlyar Supreme's patented, nitrogen-hardened D2 steel, known for its long edge life, provides very long edge life without the need for frequent dressing. The very high hardness of 61-63 HRC is a dream for any user - the knife perfectly maintains its sharpness without the need for frequent dressing.
In addition, the Alpha is made of AUS-8 steel developed in Japan, which is known for its toughness, ease of machining and sharpening, and excellent corrosion resistance. It is perfect for universal use.
American 420HC stainless steel has very high impact resistance, easy sharpening and a good price.