ZWILLING J.A. Henckels Professional"S" 7" Hollow Edge Santoku Knife 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 polymer three-rivet handle is perfectly bonded to the full tang 57 Rockwell Hardness = excellent edge retention Edge angle 10 degrees per side