eramic knives are a relatively new invention & always expensive. Basically, they're made out of a high-purity zirconium oxide powder that is compressed at very high pressures & heated in a furnace at temperatures over 2700F. This results in an extremely-hard blade, nearly as hard as diamonds. 5 Pieces Sets Black Blade Kitchen Ceramic Knife Blue Ceramic Peeler With Blue Sheathes Made from zirconium oxide, anti-bacteria, anti-fouling, non-toxic & non-corrosive. Super hard, high-density & sharp blade, not easy to be blunt. No reaction with any food & can preserve the original color & taste of the food, keep the food's freshness & nutrition. No stimulation to your eyes when cutting excitant food like onions. No transferring odors from one food item to another. Not any taste or strange smell will be left on the blade, safe, healthy & environmental friendly. The best tool for cutting the fish, fruits, vegetables, meat & guaranteeing the family especially the baby's health & the food's cleanness & health. Kindly Reminder: Intended for cutting fruits, vegetables & boneless meats, not intended for pry, flexing, violent chopping or boning. Be used on plastic or wood cutting board & avoid cutting frozen food or on the surface of marbles, glass & steel board. Wash the knife after each single use, preferably by hand with a mild detergent & do not wash it in the dishwasher. For safety's concern, the tip & the heel of the blade have been blunted. Cauti