Double Breast Pump Kit Contents (2) 24mm PersonalFit Breastshields, (2) 150mL (5 oz.) Breastmilk Bottles with Lids, (2) PersonalFit Breastshield Connectors, (2) Tubes, (2) Valves, (4) Membranes, (2) Membrane Caps, (2) Protective Membranes, Instructions UNSPSC Code 42231901 For single or double pumping: Moms dont have to pump both breasts to use the Symphony Double Breastpump Kit Symphony functions as a single pump if desired Safely collect, store and feed breastmilk: You can pump your breastmilk and store in the same container Made without BPA: All parts that come into contact with breastmilk are not made with BPA