PVC coated braided steel cables. It can be used for adults and children. Adjustable 9 inches of the cable length. Suitable for boxing, MMA, aerobics, and fitness training. The rope can be adjusted to the length you want according to your height. It can burn calories and fat while exercising your muscles during jumping. A lightweight, durable, and comfortable handle make it easy to grasp and carry. A dual ball bearing system and slight cable can pass through the air quickly, thus increasing the speed.