SPRI ES502R Xertube Resistance Band with Door Attachment and Exercise Charts The resistance recommended by SPRI for advanced men and women Perfect for home, gym, or on-the-road use Includes door attachment for additional training options Two illustrated exercise charts Measures 5 by 7-3/4 by 2-1/2 inches and weighs .6 pounds Product DescriptionThe Xertube is the [...]