Kinzi trade; Jump Rope - Fast Speed Cable for Mastering Double Unders - Best For Cross Fitness Training - WOD's - Boxing - MMA - Exercise and Fitness - Carry Case Burn Up To 1000 Calories Per Hour Easiest way to shred fat, build coordination and increase agility Safer Cardio  Jump roping has been shown to be a great alternative to running and other high impact exercises that wear out your knee joints over the long term High Quality Components  German milled steel cabling with a high quality PVC coating for smooth rotation and a lower friction coefficient, resulting in the ultimate speed roping experience Adjustable Length (Up to 9 ft)  Fits people of all sizes using the adjustable screw or a wire cutter Lifetime warranty means that we stand behind every product we sell. Buy with confidence and please don't hesitate to reach out to us!