[Package Contents] A package of 8 replacement duckbill valves and 2 silicone membranes for use with the Spectra S2, S1, and 9 Plus breast pumps. [Compatibility] Pump parts are compatible with the Spectra S2, S1, 9 Plus, M1, Dew 350, and Motif Luna pumps. [Material Used] Crafted from food-grade silicone, it can be sanitized using water, steam, or boiling water. [Cleaning Tips] Rinse with clean water after washing with soap. Hard brushes should be avoided. Clean the thin tips with fingers. Do not use dishwasher. [Aftermarket Part] This is a PumpMom aftermarket item, Not Original Spectra S2 Pump Parts.