Compatible with most Medela breast pumps: Works with most Medela breast pumps (Not for use with Freestyle(R), Harmony(R), or Sonata(R) breast pumps) Pumping customization and efficiency: PersonalFit Connectors are made to easily attach to all PersonalFit Breast Shields and sizes, including the PersonalFit Flex(TM) Breast Shields
Authentic Medela PersonalFit connectors: Same connectors that came with your Pump In Style Advanced(R) Starter Set
Made without BPA: Safe for you and baby