Monster\’s revolutionary designed Playmat Tube is prism-shaped so it can\’t roll off the table! The unique triangular shape of the tube allows more space for your fingers, making it easier to remove the playmat. The colored lid is adorned with the Monster logo while the tube if clear to show off your playmat. As with all Monster products, the Prism Playmat Tubes are made of high-quality durable plastic to keep your playmat safe and protected.