This Elvie breast shield replacement set features clear alignment markings to help position the nipple for efficient suction and comfortable expression. Available in three sizes (21 mm, 24 mm, 28 mm), these pump flanges provide a better fit and improved milk removal by matching individual breast shape. Made from 100% BPA-free Eastman Tritan EX401 plastic, this pump accessory is durable, hygienic, and dishwasher safe for easy cleaning. Includes two breast shields and is designed for use with Elvie Pump only, making it a convenient replacement or spare for busy feeding routines.