The Medela Hands-free Collection Cup Membranes are replacement silicone membranes designed specifically for use with Medela Hands-free Collection Cups and Hands-free Breast Pumps. Made from high-quality, durable silicone, these membranes help maintain optimal pump performance and efficient milk expression. As part of your regular pumping routine, inspect your pump parts frequently and replace them immediately if you notice any damage or excessive wear. Medela recommends replacing the membranes every 3–6 months, depending on your pumping frequency, to ensure consistent performance and hygiene. For the safety and longevity of your breast pump, always use genuine Medela replacement parts, as using incompatible accessories may cause irreversible damage to the pump. Each pack includes 2 silicone replacement membranes.