... : Our ceramic knives are made of ZrO2, the hardness would close to the diamond, which ensures a longer lasting cutting than ... porous surface will not let bacteria infiltrate the blade; Cleaning convenience, the foods never stick to the smooth surface. Never rusts and will ... quantity.• We usually ship by sea, air, express, etc.• The express companies we worked with are DHL, FedEx, UPS, TNT, and so ...