... blade for long time; 3,ISO 9001,LFBG,SGS Testing 4,hardness second to diamond Ceramic Knife – High Density ZirconiaModel: ... 3", 4", 5.5", 6.5", ceramic knife eriesBlade Material: zirconium dioxide (ZrO2; also ... blades availableHandle Material: ABS+TPR handleSize Available: 3", 4", 5.5", 6.5"Features: Our ceramic knives are made of ZrO2 ...