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. Kingdom Satin Cutlery matches everywhere.  (Hand Wash Recommended). Mirror finish on top and Matt Finish on bottom   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.