Flange Inserts 13-21mm For Wearable Breast Pump 24mm Shield Compatible With. Introducing Flange Inserts (14-piece Pack) – the Perfect Solution for Achieving the Ideal Fit for Your Breast Pump. Designed for Needs Ranging from 13mm to 21mm, These Inserts Ensure Comfort and Efficiency, Compatible with Popular Brands Like Medela, Spectra, and Willow, Among Others. Transforming a Standard 24mm Shield to Your Correct Size, These Inserts Are Crucial for Reducing Nipple Discomfort and Improving Milk Flow During Pumping. These Versatile Inserts Work Seamlessly with Numerous Wearable Breast Pumps, Including Models Like Momcozy and Freemie, As Well As the MISSAA Hands-free Pump. Comfort and Efficiency Are Prioritized, with Suggestions to Regularly Observe Nipple Condition and Replace Inserts Every 1 to 2 Months for Optimal Performance. Crafted from BPA-free, Food-grade Silicone, These Inserts Are Safe and Easy to Maintain. Note That Electrical Products Are Designed for US Use, and an Adapter or Converter Might Be Required for International Use. Ensure Compatibility Before Purchase. Features: - Sizes Available: 13/15/17/18/19/20/21mm - Pack Includes: 14 Flange Inserts - Compatibility: Medela, Spectra, Willow, Momcozy S12 PRO/S9 PRO/S9/S10/S12, and More - Material: BPA-free, Food-grade Silicone - Maintenance: Suggested Replacement Every 1 to 2 Months - Safety: Easy to Clean and Safe for Use - International Use: May Require Adapter/converter for Non-US Regions Choose Comfort and Efficiency with the Right Flange Size, and Enjoy a More Comfortable Pumping Experience..