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REPLACEMENT FOR SPECTRA S2 SPECTRA S1 PUMP PARTS. Contains 2 x(17mm) Flanges / Breastshields (narrow bottle neck; suitable for nipple size 14-16 mm AFTER pumping, nipple length smaller than 16 mm during 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.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.