Cliffy’s protectors for the switch slots where the ball drops from the habitrails. The left trails comes from the R2-D2 vertical kicker; the right trail comes from the center ramp.
In some of the pictures you can see mylar squares installed by a previous owner. The mylar isn’t quite centered beneath the ball drop (perhaps to avoid covering the slot). The mylar also does not protect the edges of the slots.
After cleaning the area with naphtha (Ronsolol lighter fuel) the protectors stick in place with adhesive backs.