Our Saturday Baby Straw Cups are made out of 100% food grade silicone material. Put our cups in the dishwasher at home or conveniently wipe them off on the go. Our exclusive lid plug means less mess for you with fewer spills and a tighter fit for the straw. The Saturday Baby Straw Cups are FDA approved, BPA, PVC, and BPS free. The cups hold six ounces.