hahaland sippy cups great replacement kit: Includes a weighted straw replacement, which is made of food-grade soft flex silicone and safe for babiesLeak-proof and Anti-choking: our sippy cup is designed with V-type, valve cover and water seal ring, will form a sealed state and shut off the flow if the cup is dropped, effectively prevent leaks and avoiding mess, parents don’t need to worry for their kids choking. The spout also features a built-in air vent to help ensure your baby swallows liquid, not air.Food Grade Material and Healthy to Drink: Both spout and straw are made of food-grade soft flex silicone, which is proof to bite and pull, flexible and does not hurt the baby's mouth and emerging teeth, and will help the baby's gums growingClean well: All parts can be boiled in water or washed in the dishwasher (in less than 1 minute), making cleanup a breezeKids Friendly: The 360° weighted ball design of straw moves with the position of water so that the baby can feed in any comfortable position