From Zwilling, the Four Star 10" Hollow Edge Slicing Knife features: Made from special formula high carbon stainless steel SIGMAFORGE - Single piece, forged knife Ice-hardened FRIODUR blade stays sharper, longer Precision-honed blade and laser-controlled edge for superior sharpness Ergonomic, polypropylene handle 57 Rockwell Hardness = excellent edge retention Dishwasher safe, handwashing recommended Made in Germany Imported.