One size does not always fit all, so Medela developed PersonalFit Breastshields in a range of sizes to meet every mom"s needs for maximum comfort & 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 & Baby For use with PersonalFit connectors (sold separately). Compatible with Medela breastpumps except Single Deluxe. Try Medela Quick Clean family of products for safe, easy & convenient cleaning of breastpump parts and breastmilk feeding products. Contains 2 PersonalFit Breastshields