The MediCordz Modular Bungie Cordz is used for a variety of physical rehabilitation assignments to strengthen muscles, improve agility and help prevent future injury. Developed in response to safety concerns, they will not break like latex bands. Made from premium quality, durable rubber wrapped in braided nylon, Modular Bungie Cordz provide versatility, security and comfort for the user. Consists of a single Bungie Cord with a combination mount and a metal clip for attachment to modular components. Mounting straps are heavy-duty nylon with metal D-rings and heavy-gauge metal connecting rings. Single cord is 7 feet in length. The Black resistance has 25 - 55 lbs of pull.