Materials used are untreated wood, cotton and 100% food grade siicone. Free of BPA, PVC, LEAD, PHATALATES, LATEX AND CADMIUM. Easy to clean with mild soap and water. Do not soak wooden rings. Wipe clean. Please note: teething items are intended to be used ONLY under the supervision of an adult. Please do not leave your child unattended under any circumstances. Check for wear before each use.