ZWILLING J.A. Henckels Four Star 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 polypropylene handles permanently bonded for seamless accuracy and gaps 57 Rockwell Hardness = excellent edge retention Edge angle 10 degrees per side