High Quality Silicone: our baby bottle caps are made of food-grade silicone material, which is safe, BPA free and safe to use are soft and flexible and protect children's mouth from damage LEAKPROOF DESIGN - Our water bottle caps are leak proof, and the bottle cap and mouth can be sealed tightly without leaking. The cap releases liquid when squeezed, which makes it easier for children to drink water REUSE:You can also combine it with a reusable straw to protect your baby's mouth from hard bottle opening. With the help of this silicone water bottle accessory, children will not overflow when drinking from the water bottle EASY TO DRINK - No more worrying about spraying water when traveling or at home. With our 6 sets of leak proof caps, you can turn any commercial water bottle into a convenient drinking cup Perfect After-Sales : We provide perfect after-sales, you have any questions can ask on the platform, we will reply you within 24 hours, to provide you with the perfect shopping experience.