Breast Pump Flange Inserts 5 Sizes Shield Converter Replacement 13mm-21mm. Upgrade Your Breastfeeding Experience with Our Versatile Flange Inserts. This Pack of 5 is Designed to Help You Find the Perfect Fit, Reducing the 24mm Shield Size to the Correct Size for Optimal Comfort and Efficiency. Compatible with a Range of 24mm Flanges, Including Medela, Spectra, Willow, and Momcozy S9/S10/S12 Wearable Breast Pumps, These Inserts Ensure a Snug Fit for a Comfortable Pumping Session. Made from BPA-free, Food-grade Silicone, These Inserts Are Safe and Easy to Clean. To Maintain Peak Performance, It's Recommended to Replace Them Every 1 to 2 Months. Features: - Available Sizes: 13/15/17/19/21mm (5-piece Pack) - Compatible with Various 24mm Breastfeeding Shields and Pumps - Made from BPA-free, Food-grade Silicone - Easy to Clean and Maintain - Recommended Replacement Every 1 to 2 Months Note: Ensure Compatibility with Your Local Electrical Standards Before Use. An Adapter or Converter May Be Needed for International Use..