BOGEN persists in using high quality stainless and PVD Coating procedure. 18-10 Stainless contains 18% of chromium and 10% Nickel. These to numbers, 18 and 10, refer to the chromium and nickel content, which gives flatware its rust-resistance and silver-like shine properties. 18-10 stainless steel provides the highest amount of nickel producing the greatest resistance to rust and longest held polish. 18-10 stainless steel is harmless to human, easy to clean, and strong to heat. The 420J2 stainless steel is a popular choice for knife manufacturers. 420J2 stainless steel contains medium quality carbon content and has good corrosion resistance in salt-free atmospheres and in most industrial environments. It is resistant to many chemicals and household cleaner; and, it is also a more durable steel compared to the 440 grades. Polycarbonate also has very good heat resistance and can be combined with flame retardant materials without significant material degradation. Polycarbonate plastics have really a high value for anyone to use, and polycarbonate plastic is moldable, durable, lightweight, and flame resistant. Eiffel Cutlery matches everywhere. They have various colors and easy to wash (hand wash recommended). Chopsticks : 23cm Special Instruction: 1. Please do not use detergent which contains hydrogen peroxide. Use of the typical detergent may peel off the surface of titanium-clad or cause discoloration. 2. Please use soft material to wash products. 3. Please do not use dishwasher. 4. Prolonged exposure to salt-containing water can lead to discoloration.