LOZAEVE 21mm Silicone Flange Inserts for Spectra S1 S2 Medela Breast Pump Shields Freestyle Harmony Sonata to Reduce 24mm Elastic Nipple Tunnel Down to 21mm Also Fits Freemie 25mm Cups 2pcEach

LOZAEVE 21mm inserts compatible with Medela/Spectra 24 mm breast shields. It will reduce the 24mm shield nipple tunnel down to 21mm. Also fits Freemie 25mm cups to reduce it down to 21mm., Seamless Compatibility For Optimal Milk Expression: Suitable for nipple diameter 18-20mm(after a pumping session) , or measure the circumference of nipple base about 50.24 - 56.52mm before a pumping session., Great solution for small-nippled mothers using Spectra and Medela Freestyle, Harmony, Sonata, and Swing-Maxi pumps, Proper nipple tunnel fit is essential for comfort and efficient milk output., BPA free, made of silicone material., Maintain compatibility with most Breast pump shields on different brands, with they original 24/25mm detachable shields having this insert inside.