The Medela Spare Teats for Haberman Feeder is the ideal feeder accessory for your infant. This teat features a valve slit, which allows proper flow of milk. It has a three line marking in the teat, which indicates three levels of streams for regularized flow of milk. Product Features : Has a valve slit which allows the regulation of the flow Three lines on the side of the teat indicate three different streams: short line for minimum flow, average flow line medium and long line for maximum flow One-way valve prevents the intake of air from the child and allows him to swallow slowly Made of silicone material Should be replaced regularly, shown in the instructions for use. About Medela: The world's leading brand in breastfeeding research, Medela has worked with researchers in breast milk for over 60 years, and is the #1 choice for hospitals and healthcare professionals around the world. Our mission is to empower every mom who chooses to breastfeed to do so for as long as they desire - by producing responsibly made, high quality breast pumps and breastfeeding accessories that help moms along every stage of their breastfeeding journey. Used daily and loved by moms in over 100 countries, our range of breast pumps and breastfeeding accessories have consistently won multiple awards worldwide, including Newsweek's BrandSpark® Most Trusted Breast Pump Brand in 2020.