2x One-Piece Breastshield (19 mm, suitable for mothers with niple diameter after pumping 17-18 mm) , 2 Valves, 4 Membranes; Compatible with all Medela pumps (Pump in style, Lactina, Symphony, Swing, Mini Electric) EXCEPT FreeStyle, Swing Maxi, Sonata, Harmony and MaxFlow Pro Pro+. 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 - Maymom, not original Medela parts Made of Bisphenol-A (BPA)/DEHP-free material and all components are steam safe for sterilization. Available in various sizes (13, 15, 17, 19, 21, 24, 25, 26, 27, 29, 30, 36 mm) for purchase. Maymom Brand 19 mm 2xOne-Piece Small Breastshield w/ Valve and Membrane Compatible with Medela Breast Pumps; Extra Small Shield