Content: 2x16 mm inserts, short version. Compatible with 24mm Elvie Single/Double Electric, Elvie Stride Cup. Reduce 24-mm shield nipple tunnel down to 16 mm. Compatible with Momcozy S9, S10, S12 (24mm Cup)/ LegendaryMilk (24mm Cup)/Tsrete Wearable silicone Cups (24mm Cup). Also compatible with Medela PersonalFit Flex 24mm breastshield, Motif Luna 24mm flange, Ameda Mya 24mm flange, Ameda Mya Pro 24mm flange. Maintain compatibility with most handsfree bra. You can still use most handsfree bra on the market, having this insert installed inside 24mm detachable shields. Snug fit. Unlike the other version of Maymom longer nipple-tunneled insert, there is no need to trim or cut this model of Maymom insert. Available sizes: 13, 14, 15, 16, 17, 18, 19, 20, 21 mm BPA free, made of food-contact grade silicone material. Safe for babies and mothers Maymom newly-designed flange inserts. Compatible with Elvie Single/ Double Electric Wearable Smart Breast Pump. Use with Elvie 24mm Cup. Downsize 24mm to 16 mm. Sung fit and comfortable to use. Also compatible with Momcozy 24mm Cup(S9/S10/S12), TSRETE 24mm Cup, Medela PersonalFit Flex 24mm breastshield.