The Philips Avent Natural Response Nipples in Medium Flow (Flow 3) come in a convenient 4-pack, making it easy to have a steady supply on hand for your baby's feeding needs. These clear-colored bottle nipples from the trusted brand Philips Avent are designed to provide a natural response for your baby, mimicking the feeling of your breast during nursing. With a medium flow rate, these nipples are suitable for babies who are transitioning to bottle feeding or are looking for a comfortable feeding experience. The box is open, but the nipples are new.