One size does not always fit all, so Medela developed PersonalFit breast shields in a range of sizes to meet every mom's needs for maximum comfort and pumping efficiency. Lactation professionals agree that proper breastshield fit is essential for not only comfort, but also for effective milk expression. Made without BPA - Safe for Mom and Baby. For use with PersonalFit connectors (sold separately). Compatible with Medela breast pumps except Single Deluxe. Try Medela Quick Clean family of products for safe, easy and convenient cleaning of breast pump parts and Breast Milk feeding products. Contains 2 PersonalFit breast shields Size: L 27mm.