Monster Protectors Deluxe Playmat Tube - Prism-Shaped Play Mat Tube with Snap Closure - Won't Roll Off the Gaming Surface: Monster's new Deluxe Playmat Tube is prism-shaped so it won't roll off the gaming surface. Features a double button snap closure to keep your playmat tubes secure and safe. The inside of the tube is hard plastic while the outside is a a gray fabric with a felt Monster logo patch. Fits most standard sized playmats.