Adjustable Ball Bearing Speed Rope (4mm)Adjustable Speed Rope Exercise cardio anywhere with the Valor Fitness SR Adjustable Speed Rope. The SR 4A Speed Rope is a great tool for any athlete looking to improve strength, endurance, and coordination. Speed ropes are easy to use for athletes of any level and require only a small amount of coordination to cycle repetitions while helping burn a high number of calories during a workout. Features and Benefits: BUILD YOUR BODY AND YOUR MIND: The