Flange Inserts 13/15/17/19/21mm 10PC,Compatible with Momcozy S12 Pro/S9 Pro/S12/S9 Wearable Breastpump Cup WalkbeeFlange Inserts for Perfect Fit: Our 10PC set of flange inserts is designed to provide a perfect fit for wearable breast pump cups. With sizes ranging from 13mm to 21mm, you can choose the insert that fits comfortably and securely for your specific needs.Enhanced Comfort and Efficiency: These flange inserts help improve the comfort and efficiency of your breast pumping experience. By achieving a better fit, they can enhance milk expression and reduce discomfort during the pumping process.Easy to Use: Installing these flange inserts into your wearable breast pump cups is simple and hassle-free. Just select the desired size from the set and place it inside the cup, ensuring a snug fit that suits your individual requirements.Durable and Safe Materials: Made from materials, our flange inserts are durable and safe for both you and your baby. They are free from harmful substances and designed to withstand repeated use without compromising performance.Compatible with Various Brands: These flange inserts are compatible with a wide range of wearable breast pump cups, making them versatile and convenient. Whether you use a specific brand or have multiple cups, our inserts can adapt to your pumping needs.