... 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 ... wooden or plastic chopping block at the same time.2,Please avoid chopping or prizing with ceramic tips ... disk to grill tip of knife. 2 pieces ceramic fruit knife set with anti-slip handle