CONTENTS: 8 x duckbill valve and 4 x silicone membrane. Made by Maymom, replacement pump parts compatible with spectra duckbill valve and spectra membrane. Not Original Spectra Replacement Pump Parts, S2 PLUS, or S1 PLUS, S3, Syngergy Gold Parts. Not Original Spectra duckbill and membrane replacement. US FDA Registered Medical Device (No. D192499), Health Canada License (No.26003), Australian Health and Aged Care (ID 463470). Inspected by US FDA. Comply with FDA/EU regulations for plastic materials that contact food. Test reports are conducted by independent lab and available online for reference. SAME SUCTION POWER AS OEM VALVES. The duckbill valves are compatible with Spectra flange and Maymom flange. The silicone membranes are compatible with Maymom backflow protector (Long, Short and Medium) and Spectra S1 backflow protector, Spectra S2 backflow protector. Also suitable for Ameda Mya pumps. OPTIMIZE PUMP PERFORMANCE. Replace your silicone membrane, duckbill valves regularly to optimize the performance of your breastpump. BPA/DEHP FREE. IN RETAIL PACK.; Made from BPA-free material. Can be cleaned with water steam, boiling water or microwave-steam bags. Retail packed, sealed by the manufacturer - Maymom, not Original Spectra parts.