Features: This silicone breast pump flange converter seamlessly adapts flange sizes from 24mm down to 13/15/17/19/21/24mm, offering flexible compatibility with most standard breast pumps. Food grade soft silicone, reducing nipple irritation, skin friendly design, available in 6 precise sizes (13-24mm). Great for breastfeeding mother requiring flange sizing adjustments to achieve optimal comfort and pumping efficiency during lactation. Effortlessly converts flange sizes at home, hospitals, or nursing rooms, enabling discreet and comfortable milk expression. The adapter is easy installation, which maintain safe use for repeated daily use with breast pumps. Specifications: Component: Silicone Color: green Size: 13mm, 15mm, 17mm, 19mm, 21m, 24mm(optional) Size: approx. 5.5x9.8cm/2.17x3.86inch 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.