Maymom Breast Pump Kit Compatible with Medela Pump in Style Advanced Breast Pumps; 2X Breastshields (one-Piece), 27mm, 4 Valves, 6 Membranes, & 2 Tubings; Can Replace Medela Valve, Pumpinstyle

This product is made by Maymom, and not original Medela products. It is well known that using the correct breastshield size is important for your pumping comfort and optimal milk supply. Compared to...