Features: Our wearable electric breast pump accessories are designed for convenience and comfort, making them essential for nursing moms. Made with durable PP and silicone materials, these accessories ensure safety and long lasting use. Suitable for busy moms, our wearable electric breast pump accessories provide a convenient pumping experience, allowing you to multitask while expressing milk. Whether at work, traveling, or simply needing some personal time, our wearable electric breast pump accessories offer discreet and efficient pumping, ensuring privacy and convenience in any situation. With easy assembly and compatibility with S18/S21 wearable electric breast pumps, our accessories make it effortless to maintain your milk supply and provide nourishment for your baby. Specifications: Material: PP+Silicone Type: 24mm Flange, 27mm Flange, Milk Collector, 24mm Set, 27mm Set(optional) Silicone Diaphragm: Approx. 46x40mm/1.81x1.57inch Duckbill Valves: Approx. 11x26mm/0.43x1.02inch (more detail size please refer to pictures) Suitable for S21 S18 Electric Breast Pumps Package Includes: 1x Flange or 1x Milk Collector or 1x Milk Collector with Silicone Diaphragm & Duckbill Valves note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.