Base Weights are available in two popular weights, 20lb and 30lb (precooked). They are an 18″ x 18″ x 2″ Rubber Base with a horse shoe shape designed to easily and quickly side over an Upright and Base with a convenient carrying handle. They are stackable, professional and eliminate the need for sandbags and cinder-blocks. Made from recycled rubber, these Base Weights last a lifetime!