Our clips are made with BPA free silicone and select styles also contain all natural beech wood to provide variant textures for baby teething needs. Our clips are designed to hold up to a sippy cup or snack cup. Three Hearts is passionate about making functional and safe items for the modern parent and baby. Our products are always made with 100% certified food grade, non-toxic silicone (BPA, cadmium, phthalates, PVC and lead free). We also use untreated beech wood in all of our creations. Each and every piece is handmade with love and care. CLEANING Silicone does not support the growth of bacteria or mold, so you can be rest assured that there are no nasty germs. All of our products are able to be cleaned easily in warm soapy water. DO NOT soak the metal or wooden clip in water for extended periods of time as this may cause rust. SAFETY This item should only be used with adult supervision. Small parts may pose a choking hazard. Clips are made for babies 3 months+.