Someone had rolled these pads up and taped them using clear packing tape. It was a good idea to carry them easily but it took about 30 minutes with a rag and goo-gone to remove all of the tape residue.
This is the second matt that I have purchased. I use it on a plush carpet and over time it breaks up. It does seem to discolor over time. I can't remember how long I have had the one I have now. It does make it possible to roll my chair on the carpet and saves the carpet from the chair.