Nuby 6-Pack Standard Neck Vari-Flo Non-Drip Silicone Nipples <br /> <br /> Size:6 Pack Product Description The first and only Non-Drip nipple is uniquely designed to prevent drips and spills. With a pressure sensitive valve feature safely built right into the nipple, fluid only flows out of nipple with sucking actions of baby. This special valve closes when sucking action ceases, ensuring a leak resistant bottle. The Nuby nipple massages infant's gums, aiding the teething process. With your baby's comfort in mind, an anti-colic feature was designed into the nipple, helping to prevent ingestion of air by baby, which may cause colic. Plus, they're BPA Free. From the Manufacturer 6 Pack no spill nuby nipples standard neck. <br /> <br /> Non-Drip nipples are spill and leak resistant,Baby controls flow rate of liquid in bottle,Soft textured nipple has small nubs to help aid in the teething process,Includes six replacement nipples for Nuby bottles,0 Months + / BPA Free