This breast pump parts bundle includes 1 set of replacement tubing designed specifically for Medela's Hands-Free Collection Cups, Freestyle Hands-Free, Freestyle Flex, and Swing Maxi breast pumps, plus 2 silicone membranes compatible with Medela's Hands-Free Collection Cups. The high-quality BPA-free replacement tubing optimizes your existing Hands-Free Collection Cups by providing new tubing when your current tubing becomes worn or damaged. Keeping fresh tubing on hand ensures your breast pump performs optimally for efficient pumping and milk collection. The 2 silicone membranes are spare parts for your Hands-Free Collection Cups. Medela recommends replacing membranes every 3-6 months depending on usage frequency. These authentic Medela membranes ensure your Collection Cups function properly for reliable pumping performance. Together these parts maintain your Medela breast pumping system by replacing worn components with new Medela-designed parts made from quality materials. The tubing keeps your pump working efficiently while the spare membranes enable replacing membranes on schedule, preventing declines in suction and milk collection. With continued replacement using these authentic parts as needed, moms can feel confident in consistent pumping performance over their breastfeeding journey.