Stator and rotor blades, as well as flat knives are available in a variety of steels. CHROMIUM STEEL knives contain 12 percent of chromium. They are universal and suitable for any application. HSS super-speed steel knives with 18 percent of tungsten are impressive by their long tool lives and good value for money. Blades made of PM steel show even better cutting results, depending on the material being processed. CARBIDE-TIPPED knives reach the longest service lives and optimum cutting properties due to their ultra fine grain quality.