... Testing 4,hardness second to diamond Ceramic Knife – High Density ZirconiaModel: 3", 4", 5.5", 6.5", ceramic knife eriesBlade Material: zirconium dioxide ... : ABS+TPR handleSize Available: 3", 4", 5.5", 6.5"Features: Our ceramic knives are made of ZrO2, the hardness would ... charges for both sample package and mass production.Payment:• 30% deposit in advance, balance before shipment.Communication:• If ...