The collection cups are BPA and Phthalate Free, they also feature an easy pour spout, simplifying the process of transferring milk for storage. The assembly and use process is designed with simplicity in mind: place the pump seal into the breast shield, attach the diaphragm and the diaphragm cap, insert the duckbill valve, and connect the breast shield to the pump through the collection cup. This user-friendly setup is compatible with a variety of breast pumps from brands such as Ameda, Medela, Lansinoh, Clinicare, Ardo, Avent, Hegen, and Zomee's own Z2, making them a versatile choice for many mothers