SPRI Xertube Resistance Band Exercise Cord with Door Attachment The door attachment allows you to turn the Xertube into a home gym by adding more training options Comes with one Xertube, two exercise charts and a door attachment. Designed for light and speedy mobility, the strap can be rolled up to stash in a gym bag, suitcase, or overnight trip Red Xertube is for moderately fit women or fit men. At 1-1/2 times its length, the weight equivalence of this tube is approximately 10 pounds Designed for light and speedy mobility, the strap can be rolled up to stash in a gym bag, suitcase, or overnight trip making it perfect for travel, gym, or in-home use High-quality rubber material offers progressive resistance Helps you isolate target muscles more effectively Tube Lengths: Very Light/Light = 44&quot; -- Medium = 50&quot; -- Heavy/Ultra Heavy = 53&quot; Available 5 levels of resistance: Very Light (Yellow), Light (Green), Medium (Red), Heavy (Blue), and Ultra Heavy (Purple)