The knives are made of proprietary special formula steel that has been perfected for over 280 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. Precision-forged from a single piece of steel, the SIGMAFORGE knives have an exceptionally sturdy, balanced and flexible blade.

• Manufactured in Germany
• Special formula high carbon NO STAIN steel
• SIGMAFORGE knife is forged from a single piece of solid steel
• Ice-hardened FRIODUR blade starts sharper, stays sharper longer, and has superior resilience
• Precision-honed blade and laser-controlled edge ensures ideal cutting angle for sharpness and durability
• Ergonomic polypropylene handles permanently bonded for seamless accuracy and gaps
• 57 Rockwell Hardness = excellent edge retention
• Edge angle 15 degrees per side