CONTENT: 2 piece MompMuir 21mm breast shields compatible with Lansinoh Manual, Smartpump 2.0, Signature Pro pumps. And compatible with all Medela pumps (New Medela Pump in Style with MaxFlow, Pump in style Advanced, Lactina, Symphony, Swing, Swing Maxi, Mini Electric, FreeStyle, Swing Maxi, Sonata and Harmony, freestyle flex). And compatible with Spectra S1 S2 detachable flange. COMFORTABLE FOR MOM- MompMuir ComfortFit Flanges have a soft rim that's soft on mom's skin. (1) ENSURE FLANGE FIT- Improperly fitting flanges can cause discomfort and reduce efficiency while pumping. (2) TIGHT SEAL- Helps ensure a good seal against mom's skin for efficient pumping sessions. WIDER ANGLE (105 degree) - pressure-free seal. Nipples are closer to the tunnel for proper seal. Reduce the pressure while pumping, reduce the pain during breast-pumping for moms, maintain a joyful mood. EASY TO CLEAN: Dishwasher safe. BPA and DEHP Free. FDA compliant for food contacts. Made by FDA regulation compliant manufacturer. Made by MompMuir, not original Lansinoh company, MompMuir is not affiliated with the trademark owner of Lansinoh. QUALITY RELIABLE SAFE: We work hard to provide quality, reliable, and safe pump parts for moms, so they can breastfeed as long as they want it to be. We know it's challenging, but we are here to help. Available in various sizes (17, 19, 21, 24, 27, 30mm) for purchase. Flange accessories made by MompMuir. Breast pump parts compatible with Lansinoh / Medela ComfortFit / Spectra S1 S2.