CONTENT: Nenesupply 2nd Generation 6pc. 21mm NENESUPPLY Silicone Flange Inserts compatible with 24mm of Elvie flange, Elvie Stride flange, Momcozy flange, M flange, Spectra flange, Willow flange, Willow Go flange, and Motif Luna flange. Reduce 24mm to 21mm. MADE BY NENESUPPLY. Compatible with Elvie pump parts accessories and Willow pump parts. COMPATIBLE PUMPS: Work with 24mm FLANGES of most breast pumps in the market. See product photo for illustrations. AVAILABLE IN 15, 17, 19, 21mm. SMOOTH ANGLE AND SOFT MATERIAL MAKE PUMPING MORE COMFORTABLE. Reduce 24mmflange funnel to 21mm. NO LOSS OF SUCTION- Embeded sealing circles creates a complete seal. EASY TO INSTALL & REMOVE - Easy to push in and pull out the inserts. Hassle-free EASY TO CLEAN: Dishwasher safe (top rack only). BPA and DEHP Free. Comply with EU and USA regulations for materials that contact food. Tested by independent labs for quality and safety. 21mm Green