Medela's PersonalFit Breastshields are designed to help using a breast pump comfortable and convenient. The shields are dishwasher safe to make cleanup after use an easy process. These shields are compatible with most Medela pumps. Allows you to personalize your breastshield size for maximum comfort while pumping Adaptable to almost all Medela pumps, including Pump In Style Use as extra set for traveling Attaches to PersonalFit Connectors (sold separately) Contains 2 PersonalFit Breastshields Package Quantity: 2 Features: Breast Pump Compatible Compatible With: Medela: Freestyle Safety and Security Features: BPA-free Care and Cleaning: Dishwasher-safe Material: Polypropylene S size: 21 mm M size: 24 mm (standard size, the one u get if u buy any Medela Pumps) L size: 27 mm XL size: 30 mm