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Don't assume your nipple size to be "medium". Please measure your nipple diameter before making the purchase. It will save you time of returning the wrong size of flanges.REPLACEMENT FOR SPECTRA S2 SPECTRA S1 PUMP PARTS. Contains 2 x(30mm) Flanges / Breastshields (narrow bottle neck; suitable for nipple size 28-29 mm AFTER pumping), 2 Bottles Converters, 2 Valves, 4 Membranes, 2 Silicone Diaphragms, 2 Backflow Protectors, and 2 Tubing. With the bottle from you own pump, this kit completes everything you need to use with Spectra S1, S2, and 9 Plus Breastpumps.