This is a coaster caddy I made for these little cork drink coasters I found for cheap on Amazon. They didn't slide very well on my large desk/mouse pad, so I made the caddy to hold the coaster snug and be easier to drag around on the surface.

Cork coasters can be found here: https://www.amazon.com/gp/product/B08R36NXXV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1