Maymom designs this kit for Zomee and BabyBuddha Pumps. Pump parts compatible with Zomee Z1, Z2 and BabyBuddha Double Electric Pump. It is acknowledged that pumping comfort and efficiency lies in choosing the correct size of flange (breastshield). Not every mother was created the same. One or two sizes can't fit all. Maymom creates a wide range of detachable flanges from 10mm up to 36 mm to fit the average mothers and those in search of special sizes (e.g. 13, 15, 17, 36 mm). For pumping comfort, make sure to measure your nipple diameter AFTER a pumping session, and then use the size selector of this listing to choose the size that is 1-2 mm LARGER than your nipple diameter. Content of the kit : Duckbill valve x2 Wide-Mouth Connector (With Membrane and Cap) x2 Shield x2 Tubing Adapter x2 NOTE: Tubing and Bottle are not included in this listing. About Maymom Maymom is specialized in developing breast pump parts that can work with many name brand pumps on the market. The value of Maymom is to care for each mom!