The Medela Bottle Nipple 3-Pack Bundle includes both slow flow and medium flow spare nipples compatible with Medela baby bottles. With two different flow rates, this bundle allows you to choose the nipple flow that matches your baby's feeding needs. The slow flow nipples have a slower milk flow that is suitable for young babies still learning to feed. The medium flow nipples have a faster flow for babies that feed quickly. Both nipple types are made from odorless, tasteless silicone and fit all Medela baby bottles. These BPA-free nipples can be cleaned in the dishwasher or sanitized using Medela's microwave steam bag. The wide nipple base is designed to prevent nipple collapse and allow proper latching. With this handy bundle, you have spare nipples in both flow rates so you always have the right nipple on hand.