The Dr. Brown's BPA-Free Standard Nipples 6-Pack in the Y-Cut are replacement silicone nipples that fit Dr. Brown's Natural Flow Standard baby bottles (not included). These nipples work with the bottle's positive-pressure design to create a more comfortable feeding experience for your little one. They are dishwasher safe for simple cleaning. Replacement silicone nipples fit Dr. Brown's Natural Flow Standard baby bottles (not included), which feature an internal vent system that helps reduce colic, spit-up, burning and gas Nipples work with the bottle's positive-pressure design that eliminates bubbles and vacuum for a more comfortable feeding experience for your little one Dishwasher safe Contains 6 nipples 100% high grade silicone | Dr. Browns Standard Nipples, Y Cut 9M+, Set Of 6 in Clear