Dual-Corded PVC rope. PVC wrapped around cotton cording to prevent stretchi ng. Steel bearings provide a smooth, consistent swing motion and are highly durable. Dual-injection molded handles allow for a firmer and more comfort able grip while providing the maximum in control. To adjust the length of y our rope, remove the cap from one of the handles of the jump rope, push the rope up through the handle, you will find an unused crimping clamp, figure o ut where you need to adjust your rope, re-crimp the rope be careful you can only do this once.