From the ManufacturerGraduates fun grips color spill proof cup changes color when filled with cold liquid; color reverses with warmth of hand.Product DescriptionNuk Fun Grips Spill Proof Cup - 10 oz - 2 packThese fun cups will ensure your baby wants to use them. Add cold liquid and watch the color change right before your eyes.Features and BenefitsSpill-proof Changes color when filled with cold liquid; color reverses with warmth of hand Easy-grip tapered shape, textured for better control Interchangeable lid and patented valve fit other Fun Grips Spill-Proof Cups Top-rack dishwasher safeSpecificationsAvailable in 1 pack or 2 pack 10 oz