Kyocera Revolution Series 7" Professional Chef's Knife is an Utra-sharp 7 inch ceramic chef's knife with black blade, designed for chopping, mincing, and dicing, Ceramic blade ground to microscopic precision by diamond wheels for rock-like edge with excellent sharpness retention, Totally impervious to acids, juices, oils, salts or other elements; will never rust, Lightweight, extremely balanced in the hand; ergonomic handle reduces fatigue during repetitive cutting, Hand wash only; sharpen using Kyocera electric sharpener or mail to Kyocera for free sharpening.