Duckbill Maymom duckbills compatible with spectra s1, s2, Motif luna, compatible with Ameda Mya and Mya Pro. Built to last longer than other and OEM duckbills. Made by Maymom. Not original Spectra pump parts. Work with Spectra S2 accessories. SAME suction power as OEM valves. Compatible with Spectra Flange and Maymom breastshield DO NOT contain BPA. Clean in water steam or boiling water before use. Comply with EU and USA FDA regulations for materials that contact food. Tested by independent labs for quality and safety.