From the Manufacturer
Philips avent magic cups have a non-spill soft spout and will not spill or drip. All magic cups feature a non-spill valve that opens with ease when your baby is drinking and magically closes when drinking stops. Magic cups are available in 3 convenient sizes and a variety of fun colors magic cups are BPA free.
AVENT's patented no-spill, easy-sip Magic Cup has a valve that prevents messy spills. Minimal suction is needed, making this a great cup to introduce early. Valve allows for passing of pulp. Dishwasher safe. Imported. ~9Hx4Wx4-3/4D"