TWIN Signature knives are precision stamped from a single piece of German steel, resulting in lighter weight knives that do not compromise sharpness. The knives are made of proprietary special formula steel that has been perfected over the years. Combined with ZWILLING's signature ice-hardening technique, these FRIODUR blades are harder, sharper, they will NOT STAIN or chip and they retain their sharpness longer.To ensure an ideal cutting angle, the laser-controlled edge is incredibly sharp and is honed and hand-finished by the most skilled artisans. The three-rivet handle embedded with the ZWILLING J.A. Henckels logo provides optimum durability. Manufactured in Germany Special formula high carbon NO STAIN steel One-piece precision-stamped blade for a lighter weight knife without sacrificing strength Ice-hardened FRIODUR blade starts sharper, stays sharper longer, and has superior resilience Ergonomic polymer handle is perfectly bonded to full tang Traditional, three-rivet design is embedded with ZWILLING J.A. Henckels logo 57 Rockwell Hardness = excellent edge retention Edge angle 15 degrees per side