The SipKit toddler cup conversion set is the perfect solution for parents who want to help their little ones transition from bottles to sippy cups. Each kit includes an ergonomic grip collar that gives your child the confidence to hold and sip independently and an easy-to-clean, leak-proof 2-piece straw made from the same platinum-cured silicone as our RealFeel nipples, ensuring a safe and hygienic drinking experience.To be used with the BuubiBottle Max 8oz.Free from BPA, BPS, PVC, phthalates, microplastics, estrogenic activity, lead, latex, other toxins.