Make sure this fits by entering your model number. Jump Rope with Smart Counter: Designed with HD LED display, which shows Timer, Weight, Calorie and Circles. It will record the number of circles you jump and show the calories been burn. Simply set your weight and workout to reach your fitness goal at any time. Built-in Quality Steel Ball Bearing: These jump ropes built-in high-quality ball bearings to provide a smooth exercise experience. It will avoid twisting, winding, or bending and ensure fast and stable rotation. It can bear a heavy load and brings your a perfect exercise.