【Updated Designing, Perfectly Fit&Efficiency】：The newly upgraded the shape of flange tunnel tunnel facilitates faster penetration of breast milk into the container and preventing backflow,ensures a perfect fit, improves milk output efficiency.We also add tiny handle on the top, make install and removal more easier ,Experience a smoother, more efficient pumping journey, ideal for new or expecting moms who want to pump with confidence and comfort. 【Highly compatibility】：The flange insert perfect fit for Momcozy M9/M6/M5/ V1 pro/ V2 pro/S12 pro/S9 pro , and also compatible with Medela/Spectra/eufy/Lansinoh/Elvie/MOMMED/NCVI/TSRETE, designed for most 24mm flange/shield.Flange inserts offer crucial comfort and support, adjustable to nipple size for a more effective and comfortable breastfeeding experience, reducing discomfort and promoting breast health. 【Safe and Gentle】: Our flange insert are crafted from food-grade silicone, BPA-free, ensuring the safety of both you and your baby. The soft-touch material provides a snug fit, promoting efficient pumping without causing irritation or discomfort. 【Match Correct Size,Customized Comfort】: These breast pump flange insert kits are designed for most 24mm wearable pumps. We have developed 15mm/17mm/19mm/21mm flange inserts size to meet for most mothers during different stages of breastfeeding. If your nipple rubs or feels squeezed in the flange channel, it is an unsuitable flange size and you need to replace the right size flange insert. 【Easy to Clean】: these silicone flange inserts are easy to clean and maintain. They can be sanitized using around 100°C (212°F) water steam or boiling water, easy to clean and dishwasher safe.For optimal performance and maximum milk output, we recommend replacing the flange inserts every 1-2 months. 0