The breast pump flange inserts are made of medical-grade silicone, durable and easy to use. Compatible with electric and wearable breast pumps, they are simple to install and replace. Features - Color: As shown - Material: Silicone - Dimensions: 4.60 x 4.60 x 3.40 cm (1.81 x 1.81 x 1.34 in) - Available sizes: 13 mm, 15 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 24 mm - Smooth, burr-free surface for comfort and skin safety - Soft, flexible silicone ensures a secure and comfortable fit - Designed for reliable performance and long-term use - Easy to clean and maintain Packaging includes: 1 x 24 mm flange insert 1 x 21 mm flange insert 1 x 20 mm flange insert 1 x 19 mm flange insert 1 x 18 mm flange insert 1 x 17 mm flange insert 1 x 15 mm flange insert 1 x 13 mm flange insert