... rusted,never discolor; 4.Heat proof,Hygiene; 5.Abrasion resistance Ceramic Knife – High Density ZirconiaItem No.: JH3A1-P02,JH4A1-P02 ... -P02,JH6A1-P02Model: 3", 4", 5", 6", 7" ceramic knife A seriesBlade Material: zirconium dioxide (ZrO2; also known as ... ’s Knife153mm36mm2.0mm130mm283mm7-inchChef’s Knife178mm42mm2.2mm130mm308mm Features: Our ceramic knives are made of ZrO2, the hardness would close to ...