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