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.