These are replacement rings for the animal marker rings in Pangea Deluxe Edition — ones that actually fit the bases snugly and move with the pieces! Note that the bases of each animal group are different sizes (save for the Sauropsida and Synapsids), so you'll need to print different sets of rings for each group.
I printed 1 red, 4 gray, and a number of green equal to the number of animals minus 1 for each group. I keep them bagged with the pieces for each individual player, so as to prevent them from getting mixed up, as the size differences are not visually obvious.
The author marked this model as their own original creation.