Features: Easily change between different size with this convenient flange insert for your breast pump, 24mm to 14/16/18/19/20/21/22mm optional! Compatible with most standard pumps, it provides a comfortable and unique pumping experience. Made from silicone, this soft and flexible flange insert ensures a secure seal while reducing discomfort and irritation, it is safe for both mom and baby, making it an essential accessory for breastfeeding moms. Designed for regular pump users, this flange insert helps optimize pumping and maximize milk production, perfect for working moms or those who need to build up their milk supply. Take this compact and lightweight flange insert with you, whether at home or travel, it is easy to attach to your breast pump for hassle free pumping. Engineered to adapt to different bottle types and sizes, this converter provide a hassle-free solution for expressing milk directly into your preferred containers, its durable construction ensures a secure and tight seal, preventing leaks and spills. Specifications: Material: Silicone Size: 14mm, 16mm, 18mm, 19mm, 20mm, 21mm, 22mm(optional) Package Includes: 1 Piece Breast Pump Flange Insert note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.