Dallas Cowboys NFL Mayan Circle Desktop Calendar. The ultimate football fan's desktop accessory - a one-of-a-kind, Mayan Themed Calendar! Measuring approximately 8 inches in diameter, this calendar is designed to be the perfect size for any desktop or workspace. Made from high-quality, durable wood, this calendar is not only beautiful but built to last. Whether you're using it to keep track of important dates, to plan your next tailgate party, or simply to display your love for the game.