100% silicone, non-toxic jewelry that is effortless and stylish for mom to wear and safe and soothing for babies to us as a teething aid. Necklace features a break-away clasp as an added safety feature. Easily cleans with dish soap or can go in the dishwasher (top rack). Free of BPA, lead, phthalates, cadmium, and metals. Please note these are not intended as toys usage as teether requires adult supervision.