Our clinically proven'Anti-colic valve is designed to reduce colic and gas Features: -Unique Anti-colic valve is designed to reduce air ingestion -Easy to clean, few parts for easy cleaning and assembly -Secure Latch, the nipplke is designed not to collapse, for a secure latch and uninterruoted feeding -Included 2 bottles of 9 oz / 260ml -1m+ flow nipple -0m+ Material: (Bottle) BPA free, Polypropylene (Teat) BPA free, Silicone