Breastfeeding moms, this flange sizing kit is exactly what you need for comfortable and effective pumping! The set includes 10 inserts in 5 different sizes - 13mm, 15mm, 17mm, 19mm, and 21mm - so you can find your perfect fit without buying multiple complete flanges. They're designed to work with standard 24mm flanges from popular pump brands like Momcozy, Spectra, Medela, Elvie, TESETE, and Bellaaby. Getting the right flange size is crucial - too small and it's painful, too large and you don't get good milk output. These inserts let you experiment with different sizes until you find what works best for your body. The material is smooth and comfortable against sensitive skin, and they're easy to insert into your existing flanges. Having multiple sizes is also great if your nipple size changes throughout your breastfeeding journey or between pumping sessions. The kit takes the guesswork out of flange sizing and saves you money compared to buying individual flanges in different sizes. Proper fit means more comfortable pumping sessions, better milk removal, and ultimately better milk supply. If you've been struggling with pumping discomfort or not getting enough milk, the problem might be your flange size rather than your pump. This affordable sizing kit lets you solve that issue without breaking the bank. Every breastfeeding journey is different, and having the right tools makes all the difference in making pumping work for you and your baby!