Bess Nursing Bottle with Nipple for calves is ergonomically designed for ease of use and handling. Round shaped bottle is easier to clean and minimizes corners for bacteria to hide. Made from high-density polyethylene with snap-on nipple included. Snap-on nipples are composed of clear, high-quality synthetic rubber to visibly see inside the nipple. Functions much like a real cow’s teat, only allowing milk to pass through while the calf is suckling. Round shape calf nursing bottle allows for easier, faster and more effective cleaning compared to square bottles. Made from high-density polyethylene increases longevity and eliminates tearing.