Go literally years without resharpening when you use these stain and rust proof knives. Excellent for slicing boneless meat, vegetables and fruit, the razor-sharp ceramic blade imparst no metallic aromas or flavors to food. Made from zirconium oxide, the blades are fired at extremely high temperatures and then ground and polished on a diamond wheel. For best results, use on a plastic or wood cutting board and avoid using for prying, cutting frozen foods or bones. Hand wash. Kyocera's peelers, slicers and knives all feature the finest, highest-technology ceramic blades available. These unrelenting blades are a full 50% harder than steel and are made of the same chemically-stable, lightweight, rust-proof, non-corrosive material found in space shuttle components and Formula One racecars. Kyocera's razor-sharp, ceramic blades will stay sharper 10 times longer than a steel blade and are impervious to stains, acids, oils and salts. Despite this strength, Kyocera ceramic blades are half the weight of steel.