Copper Brushed Link Chain sold by the foot measures 22mm and 18mm Round - 3 small then large. The Copper chain has been hammered then brush finished for added brilliance. The metal chain is an approximate 2mm metal width and 1mm thickness soldered to ensure a perfect link. Each metal chain link has been treated with an "eCoating" to supplement the durability of the metal to environmental factors such as oxidation. This coating is non-toxic and will retain the original luster of the metal. The metal will stay bright longer and the coating contains no harmful chemicals.