1,6 pieces ceramic knife set 2,Size:4"-7" for blade 3,Hygiene,Abrasion resistance ... high-tech Zirconia crafted, high-density, high hardness, never wear.2, Hardness (HRA90) is next to diamond, and abrasion performance ... in an extremely-hard blade, nearly as hard as diamonds.2, Sharpness: The materials that make up a ceramic blade ... if you have any questions. 6 pieces ceramic knife with ceramic handle