This chain is an original Bico design made from individually cast and hand finished pewter elements that are then assembled on a rubber cord. The metal is plated with pure silver, matte finished by hand, then coated with a premium protective layer to extend the wear life. Caring for your Bico Product: Chemicals used in traditional jewelry cleaning methods must not be used when cleaning your BICO product. Gently rinse your product in warm water and dry it with a soft cloth. Direct exposure to colognes and aftershave, pool products, and excess sweat can affect the coating and plating of your product. Furthermore, pendants and chains should be rinsed and dried if worn in the ocean.