Our Saturday Baby Adult 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 adult cup holds 28 ounces and has all the same features of our kids cup. Now you can officially match your little one! Of course you can always feel safe knowing that all of our products are FDA approved, BPA, PVC, and BPS free. All of our kid straw cup fit six ounces.