Set includes one pair each of hard plastic Medium, Large, and X-Large shields plus a pair of adapters for Spectra pumps. These are not silicone.
No other parts needed, use your Spectra bottles, backflow protector, and valves.
This set will also work for all Medela, Lansinoh, and Hygeia pumps, as well as Spectra pumps.
Click here to determine if this is the right set for you: https://pumpinpal.com/help/