By using high purity Zirconia super fine powder as raw material, it is manufactured through forming, firing and precise processing, thus it owns such properties as high hardness, acid/alkali - resisting, wear - resisting and high toughness. Its hardness is just next to that of diamond, and the property of anti-abrasion is 60 times that of metal products. The edge of the knife is incomparable sharp and never gets corroded. Due to the homogeneity of materials, the surface is highly smooth and thus easy to clean. Moreover, due to the peculiar bacteria-free design, the knife will never react with food, thus reducing the chance of bacteria breed, and causes no effect to the tastes of the food. In general, it is non toxic, hygienic, and rustless