Zwilling J.A. Henckels 33600-133 ZWILLING Pure Serrated Utility Knife, 5-inch, Black FRIODUR ice-hardened blade for exceptional durability of the cutting edge and corrosion resistance. Stainless special formula steel, ZWILLING specially fused materials: These knives are robust, corrosion-resistant and flexible at the same time. SIGMAFORGE knife - one-piece precision forging Ergonomic polypropylene handle: For fatigue-free and safe working with the knife. Made In Germany