Connect this attachment to your door, and have on-the-go training! This attachment greatly increases your exercise options with any resistance band. It’s compatible with the SPRI Xertubes, and Braided Xertubes as well as other resistance bands. This door attachment makes it easier to work on chest, back, and shoulders from a variety of angles. Made from lightweight heavy-duty woven nylon, it won’t damage your band like standing on it or wrapping it around the doorknob. This strap fits securely in any hinged doorway.