These discs can be used to glue figurines to them and mount them into the various clips on the Toy Story 4 pinball playfield.
40.5mm is for the back right clip, where Buzz is currently mounted.
46mm is for the middle right larger clip, where Bunny is mounted.
33mm is for the middle right smaller clip, where Ducky is mounted.
29.6mm is for the left side clip where Bo Peep is mounted, and the front right clip where Forky is mounted.
The author marked this model as their own original creation.