2x One-Piece Breastshield (21 mm, Small) , 2 Valves, 4 Membranes; Compatible with all Medela pumps (Pump in style, Lactina, Symphony, Swing, Mini Electric) except FreeStyle and Harmony.;US FDA registered medical device (No. D192499); Products are inspected by US FDA. Complies with US FDA and EUstandards for containers that contact food and class II medical device; Test reports are online for your reference;;Retail poly-bag packed; sealed by the manufacturer.;Made of Bisphenol-A (BPA)/DEHP-free material and all components are steam safe for sterilization.;Available in various sizes (15, 17, 19, 21, 24, 25, 26, 27, 29, 30 mm) for purchase.