BOT features an innovative straw technology that moves to the liquid whenever the cup is tilted allowing the child to sip to the last drop. The cup is designed with a simple integrated handle and lid to eliminate lost parts. The handle, lid, and base is made of polypropylene while the straw is made from food-grade silicone and a steel weighted ball. Features: * BPA/Phthalate/PVC-free * 100% silicone and nitrosamine free