... tech Zirconia crafted, high-density, high hardness, never wear.2, Hardness (HRA90) is next to diamond, and abrasion ... extremely-hard blade, nearly as hard as diamonds.2, Sharpness: The materials that make up a ceramic ... After it’s sharpened, it can keep its razor sharp edge and will not wear out.3,No ... wooden or plastic chopping block at the same time.2,Please avoid chopping or prizing with ceramic tips ...