Amazon.com : Speed Jump Rope–Speed Rope for CrossFit, Boxing, MMA and Exercise Training–Cable Jump Rope Self-Locking–Wire Jump Rope Adjustable up to 14 inches–Fast Jump Rope with Anti Slip Aluminium Handle (Black) :
Amazon.com : Jump Rope Take Your Workout to the Next Level - Features Ball-bearing System and 6 Inch, Extra-Long Handles That Foster Extreme Speed Jumping - Comes With a Carrying Bag, Rapid