Waterdeep Dungeon of the Mad Mage Playmat- Dungeons & Dragons Cover Series - Rules of Play says:

Up your game at your next game night with these official Dungeons & Dragons playmats showcasing highly detailed and vibrant cover artwork from popular role playing game. Made with a premium fabric top to prevent damage to cards, minatures and dice 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.