Adhesive Backed Cork Square - size 3.5" x 3.5". Make your own tile coasters. Simply peal off the white paper and center on your tile. These are made for 4" x 4" tile coasters. They come to me in a huge roll, so they will have a little cupping when you get them. Once they are stuck to your tile they will remain flat. I believe cork backing is much better than felt backing for tile coasters.
-- Set of 24 -- 1/16" thick -- 3.5" x 3.5"
I also sell these in a set of 12. If you need larger quantities please convo me.