This chain is made from solid brass, not steel or zinc like cheaper chains. The chain is plated with pure silver, oxidised, polished by hand to a shiny finish, then coated with a premium protective layer to extend the wear life. Perfect for combining with the BICO BT and BTS pendant range. 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.