... Ceramic Knife – High Density ZirconiaModel: 3", 4", 5.5", 6.5", ceramic knife eriesBlade Material: zirconium dioxide (ZrO2; also ... smooth surface. Never rusts and will not taint food with metallic taste.Factory Advantages: ISO Certificate, LFGB,SGS ... , air, express, etc.• The express companies we worked with are DHL, FedEx, UPS, TNT, and so on. ... better services to you. Thank you. 6.5 inch ceramic knifes