Easily convert the diameter of your with this silicone converter 28 to 13mm/15mm/17mm/19mm/21mm/24mm, providing better pumping . Craft from safe component, ensuring compatibility with different size. Suitable for mother who require small diameter , especially those with specific need and preference. Suitable for various occasion such as home, hospital, and travel, easy to use wherever you go. Enhances your breast pumping routine with this user friendly silicone converter, offering convenience and ease of use.