Leak-proof drinking cup for leak-proof drinking Super bite-resistant mouthpiece for first teeth The Philips Avent My Grippy mouthpiece has a unique valve and ensures a leak-proof cup - this is confirmed by mothers Its non-slip structure and contoured shape for small hands help children drink independently. Mothers confirmed tightness* Advanced valve - drink without spill Super bite-resistant mouthpiece Super bite-resistant mouthpiece for first teeth Comfortable grip Contoured shape and non-slip structure Other benefits Small number of parts - easy assembly and cleaning (dishwasher safe) BPA free (0% BPA) Compatible with all Philips Avent bottles and cups Philips Avent follows for your childs development * Independent market tests in the UK in September 2013.