Breastfeeding moms, these DIFKING flanges are absolute lifesavers if you need replacement parts for your Spectra pump! The 16mm size is one of the most common flange sizes, and having a 2-pack means you always have a spare ready to go. What's great is they're compatible with multiple pump models - Spectra S1, S2, 9 Plus, Synergy Gold, and even Motif Luna and Ameda Mya pumps. The BPA-free food-grade plastic is safe for both you and baby, and they meet the same strict safety standards as the original parts. I love that they're so easy to clean - dishwasher safe on the top rack, or you can sanitize with steam, boiling water, or microwave bags. The suction power is identical to OEM Spectra parts, so you don't have to worry about decreased performance. Having properly fitting flanges makes such a difference in comfort and efficiency, and these deliver exactly what you need at a much more affordable price than buying directly from the manufacturer. Whether you need replacements because your original flanges are wearing out, or you want spare sets to reduce washing frequency, these DIFKING flanges deliver both the quality and value that busy pumping moms appreciate. They're that perfect solution for maintaining your pumping routine without breaking the bank!