Cooks Concept 2-Piece Ceramic Santoku Paring Set Ceramic Knife is super sharp, never need sharpening, it is 10 times hard than regular steel. Ceramic Knife has NO metal taste when cut delicate vegetable such as tomato. Ceramic Knife is non-reactive with food, keep original taste and color of fruit and vegetable. Ceramic Knife is easy to clean, no rust, hygiene and keep you away from germ and bacteria. CARE & USE INSTRUCTIONS You should avoid the following: Do Not cut frozen foods or bones. Do Not drop on hard surfaces.Do Not carve, pry or flex. Do Not wash in the dishwasher.Do Not use as a scraper. Do Not hit against china or flatware.Do Not put the blade in open flame (ceramic conducts heat ). Do Not sharpen ceramic knife with a conventional sharpener (diamond wheels are required to sharpen any ceramic knife ). Your ceramic knife works best for slicing boneless meats, fruits and vegetables. Avoid flexing or prying or carving into bones. Use with a plastic or woodcutting board. Avoid cutting on marble or stone or any hard surface like plates or kitchen tile. Hand wash with water and liquid dish detergent. A mile bleach solution or acetone will remove any discoloration if by normal washing can not remove. Protect your knife by storing with a knife sheath, knife block or place in knife tray.