Silver polished stainless steel/ 18k gold plated stainless steel Allergy information: Hypoallergenic Length: Adjustable 42cm / 16.5" + extends to 47cm / 18.5" Polished stainless steel / 18k gold plated stainless steel 1.2mm diameter thin and delicate chain 11mm x 6mm padlock charm (18k gold plated stainless steel/polished stainless steel charm) 3mm thickness of charm (rounded edges lock) Shipped within 1-2 business days 14-day returns Waterproof | Tarnish resistant | Hypoallergenic Enjoy the elegance of 18k gold plated 316 stainless steel with the strength of medical grade 316 stainless steel. With a stainless steel chain, there's no more green discoloration on skin. Stainless steel is a metal that is very stable and does not react. Classified hypoallergenic for sensitive skin. The advantage of stainless steel over other jewelry like sterling silver is that stainless steel is a metal that does not tarnish nor corrode by chemical reaction with water or other substances like perfume or creams. It is a metal that stays shiny and doesn't require maintenance, unlike sterling silver or other gold plated jewelry.