2x Two-Piece Breastshield (14 mm, suitable for mothers with nipple_diameter after pumping 12-13 mm). Compatible with all Medela pumps (New Medela Pump in Style with MaxFlow, Pump in style, Lactina, Symphony, Swing, Mini Electric, FreeStyle, Swing Maxi, Sonata and Harmony, Freestyle flex. 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. Tested by independent labs for quality and safety. Test reports available for reference. Retail poly-bag packed; sealed by the manufacturer - Maymom, not original Medela parts. Made of Bisphenol-A (BPA)/DEHP-free material. Can be cleaned with boiling water or water steam. Available in various sizes (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 34, 36mm) for purchase. It is well known that using the correct breastshield size is important for your pumping comfort and optimal milk supply. It is also known that one-piece design offers easy to clean, fewer pieces to keep, and no seams to lose suction power.