The Freemie flanges are 25mm and 28mm. There are a lot of women who need different sizes beyond those! Thankfully, there are a few different options for inserts that you can use to help make the flanges fit so you can do this hack! Fitme Inserts - These are created by Freemies, and the inserts go from 15mm all the way up to 26mm. Maymo m Flange Inserts are another popular brand that might you might consider Beaugen Pump Inserts - these primarily are designed to help with comfort while pumping and elastic nipples, however, they can sometimes add a little extra cushoining and help when you are between sizes. Use the code TBM10 for 10% off.