... knife cannot compare:·Nanotechnology, made of super pure Zirconia fine.·High degree of hardness,only second to diamond (vs. ... sharp for years.·Freshness, keep the fresh taste of food after cutting, no metallic smell left.·Easy ... board. Do not use it on the surface of marble, glass or stone.·Never use ceramic ... 5-10 minutes, and keep the handle out of the boiling water. The handle needs no disinfection. ...