Contains 2valves, 4 membranes, 2 pump-in-style tubes and 2 Two-piece breastshields, 19 mm and 2 base connector; Comparable to Medela small breastshield or medela 21 mm breastshield. US FDA registered medical device (No. D192499), Health Canada License (No.26003), Australian Health and Aged Care (ID 463470). Complies with US FDA standards for containers that contact food and class II medical device. Passes FDA inspection. Test reports are online for your reference. BPA free; Retail poly-bag packed; Sealed by the manufacturer -Maymom. Bottles are not included. You can use any Medela bottles or other cheap standard sized bottles (like Gerber, Nuk, and Playtex available from your local drug/grocery/dept stores). Maymom pump parts compatible with Medela Pump in style pump. NOT compatible with Medela Pump in Style with Maxflow Pro Pro+, Swing Maxi, FreeStyle, Sonata, Symphony, Harmony.