?Warm Tips? The usage time of accessories depends on the practical frequency and cleaning method. We recommend that the accessories of the breast pump be updated every three months. However, if any damage or mold is found, the accessories should be replaced in a timely manner for hygiene and normal use needs. If you are unable to determine the issue with the accessories, please contact the KISSBOBO after-sales team in time. ?Safe and Easy to Clean? Our flange inserts are made of food-grade silicone and are BPA-free. They're easy to clean and maintain, so you can use them with confidence. ?Comfortable and Efficient Pumping? The size of your flange insert is important for comfort and efficient pumping. Some moms experience nipple swelling while milking, so it's important to observe the appearance of the nipple during pumping. ?Compatible with Most Wearable Breast Pumps? These inserts work with any S9/S10/S12 Wearable Breast Pump, including popular brands like Momcozy, TSRETE, Luxlady, and more. They're also applicable to most other brands of models for 24-25mm (Freemie) and compatible with MISSAA hands-free breastpump. ?Perfect Fit for Your Nipples?KISSBOBO Flange Inserts to help you find the right fit for your nipples. They're compatible with Medela PersonalFit 24mm Shields, Spectra 24mm flanges, Willow 24mm flanges, and Momcozy S9/S10/S12 Wearable Breastpump 24mm cups. They'll reduce the 24-mm shield nipple tunnel down to the correct size (not for 27mm shield).