... 1)Harmless to your skin 2)To make the surface smooth 3)Economical, strong cleaning capacity ... Chinaware, marble surface, glass eliminating copper cleaning ball1. The material is copper , there are H60,H62,H65, ... .2. It is widely Used in kitchen to clean and household ware's cleaning.3. It doesn' ... hurt the pots & pats, of course, don’t also hurt our hands.4,Accept the OEM Copper-plates the clean ball