1、Broad compatibility, suitable for traditional breast pump, plug-in breast pump, and wearable electric breast pump. 2、Practical for small-nippled mothers to use large breast pump, avoiding nipple trauma or irritation. 3、Made from food grade silica gel, no odor, friendly to mothers’ sensitive skin, secure to use. Features: Broad compatibility, suitable for traditional breast pump, plug-in breast pump, and wearable electric breast pump. Practical for small-nippled mothers to use large breast pump, avoiding nipple trauma or irritation. Made from food grade silica gel, no odor, friendly to mothers' sensitive skin, secure to use. A practical breast pump replacement for breastfeeding, making milk expression more comfortable and efficient. Specifications: Color: White and transparent Material: Silica gel Note: The milk pumps showed in the pictures are not included. Package List: 1 * Flange Inserts 1 * Flange Inserts