Features_x000D_Broad compatibility, suitable for traditional breast pump, plug-in breast pump, and wearable electric breast pump._x000D_3 sizes of flange inserts suitable for different breast pumps: 17mm, 19mm, and 21mm, ensuring that every mother has fitted breast pump._x000D_Practical for small-nippled mothers to use large breast pump, avoiding nipple trauma or irritation._x000D_Made from food grade silica gel, no odor, friendly to mothers' sensitive skin, secure to use._x000D_A practical breast pump replacement for breastfeeding, making milk expression more comfortable and efficient._x000D_Specifications_x000D_Color: White and transparent_x000D_Material: Silica gel_x000D_Product Size: 17mm/ 0.66inch; 19mm/ 0.74inch; 21mm/ 0.82inch_x000D_Product Weight: 15g/ 0.52oz_x000D_Note_x000D_The milk pumps showed in the pictures are not included._x000D_Package List_x000D_3 * Flange Inserts_x000D_