Mute Sports Equipment The Bar One Arm Adaptive Jump Rope Mute Sports has been manufacturing the Bar Jump Rope in the USA since 2017. Every Bar jump rope is custom built from color options to cable length. It is specially designed for those with the use of one arm. However everyone can make use of this fine piece of equipment by improving coordination balance between your left and right arms. Can help improve motor skills. The heavier black cable is made with aircraft cable and is galvanized to prevent rust. The upscale nylon coating wears well. Be sure to always jump on a smooth surface such as a gym floor.