Compatibility: The Flange Inserts 8pcs are breast pump accessories that can be used with most 24mm Shields/Flanges.Compatible with any S12 pro/S9 pro/S12/S9/TSRETE/Medela/Spectra/Opnmina/Elvie/Willow/Bellaaby/Motif Luna/Ameda/MOMMED/MYA/Ainsir/Phanpy/Lulia/NaNaLazy/Luxlady/kidzio/eulumap/Teexin/Fisroa/KISSBOBO/Goldeep/BIOBOO/Mumeasy/Nanawawa/TOVVILD etc 24mm flange/shield(Not for 27mm flange/shield) Usage: GOCROWEEN flange inserts sets contain two of each size (5 sizes in total), which can be used to find the correct size for your nipples. At least two flange inserts can be used simultaneously for work. Save: These replacement pump parts will save you the hassle of testing nipple size and selection. Many moms have nipples of varying sizes that can also change in size at different times. If your nipple size is less than 24mm, we have a suitable set for you. Safety: Made of transparent silicone material,our product is BPA-free you can use it with confidence. Wide Application: These breast pump accessories are only suitable for 24mm Shields/Flanges and cannot be used with other sizes of Shields/Flanges. Using coconut oil or nipple butter can reduce friction and make them easier to use. 0