Willow 3.0 Breast Pump Flanges Size:24mm The non-skid blue backing is

The non-skid blue backing is waterproof to prevent leakage

Easily and discreetly attach the Elvie Stride Hub to your waistband

The Flex breast shield has an oval shape

Accurate Results: Delivers precise blood glucose readings for reliable monitoring

Willow 3.0 Breast Pump Flanges Size:24mm The non-skid blue backing isUsing the correct size breast shield makes pumping more comfortable and more efficient. Use one of these helpful guides to find your best fit. Keep in mind that each breast could require a different size and that sometimes your sizing needs can change. Shields are clear for easy placement and assembly. Dishwasher safe. For use with Willow spill proof milk bags. The manufacturer recommends replacement every 3 months.