Made out of heavy duty coated nylon that is 1.25 inch in diameter. 36" le ngth for full triceps and arm extension. Molded and ribbed rubber ends ar e ergonomically designed to provide the maximum in traction and pulling leve rage during use. Rubber rope ends have an internal bearing mechanism that provides full rope rotation during training. Rope is supported by a forg ed steel grommet that hooks into any universal gym system. For training t riceps, biceps, back, shoulders and abs.