Metal Zipper 1,Pass ISO9001.OEKO-TEX standard 100 2,Material:copper 3,Tape: black and red;Teeth:anti-silver and plated silver ... colour brass,nickel,anti-silver ,anti-brass,aluminium etcTypeO/E,C/E, 2 way O/E,2 way C/E,long chain etcLength ... . used it in rubber boots, galoshes, and called it the 'zipper' because the boots could be fastened with one hand. Components ...