MTG: M21 V4 Playmat - Rules of Play says:

Up your game at your next game night with these official Magic: The Gathering playmats showcasing highly detailed and vibrant artwork from popular trading card game. Made with a premium fabric top to prevent damage to cards during game play for tabletop gamers. With dimensions of approximately 24" X 13-1/2", this playmat is also the perfect decorative over sized mouse pad for computer and laptop workstations. Non-slip rubber backing lets the playmat lay flat and prevents it from shifting during use.