Copper BraceletsThese open cuff bracelets have enough adjustability in them to mold to your own wrist. Please select size and style in the options. Care Instructions: Copper will darken with oxidation over time how quickly depends on various factors including humidity in the air, body chemistry whether or not it is exposed to chemicals in soaps, cosmetics and cleaning products. Copper can leave a green colour to your skin, this is not harmful and can simply be washed