ZWILLING J.A. Henckels Professional"S"10-Inch Chef's Knife Manufactured in Germany Special formula high carbon no stain steel Sigma forge 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 polymer three-rivet handle is perfectly bonded to the full tang 57 Rockwell hardness = excellent edge retention Edge angle 15 degrees per side