The NUK Advanced Hard Spout Sippy Cup will make your little one feel like a big kid. The hard spout is bite resistant, making it a great option for kids who love to chew on their sippy cups. And its unique flow-control valve helps to regulate the amount of fluid your child gets with each swig. This 10 oz. sippy cup is 100% leak-proof and spill-proof, guaranteed, to stand up to toddler play. Plus, you'll love that it's BPA-free and dishwasher-safe.