Turn Any Standard Drinking Glass Into The Perfect Sippy Cup – Perfect For Independent Little People Transitioning From Bottles To Cups. Made From 100% Food Grade Silicone, Simply Stretch Your Silicone Top Over The Rim Of Any Standard Size Glass And You Have The Perfect Leak-Proof, Reusable And Fun Sippy Cup! 100% Food Grade Silicone. Bpa, Pvc And Phthalate-Free. Anti-Colic, No-Spill Design