CONTENT: 2pc. 21mm NENESUPPLY Silicone Flange Inserts compatible with 24mm of Elvie flange, Elvie Stride flange, Momcozy flange, Medela 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. MADE FROM SOFT SILICONE: Soft silicone makes pumping more comfortable. Reduce flange funnel to 21mm. Suitable for moms with smaller nipples. Correct flange sizes make pumping more efficient. 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. Flange Insert