[Compatible: These flange inserts compatible for TSRETE/Momcozy Medela/Spectra/Willow/Elvie/kmaier/Phanpy/Bellababy/NaNaLazy/KISSBOBO wearable breast pump 24mm flanges (Not for 27mm shield) Flange sizing kit allow you to adapt your breast pump to the appropriate size for optimal suction. Perfect for figuring out your optimal flange size "Supper Comfortable: These flange inserts are made with BPA-free food-grade silicone while should give you peace of mind about your babys milk. They are very comfortable while in use especially when used with a little nipple cream" Game Changer: The right sizing helped enjoy a cozy pumping experience had no issues with pulling or uncomfortable. The flange insert breast pump parts also solved the problem of having pain from using a large flange Tag:14mm 16mm 18mm 20mm flange insert13/14/15/16/17/18/19/20/21mm flange insert breast pump partsflange sizing kitflange insert kitA variety of packaging for you to choose from]