Jump Rope - Fast Speed Cable with 4 High-Grade Metal Ball Bearings - Designed to Increase RPMs, Master Double Unders 4 high-grade metal ball bearings. Do not be fooled by trying to save a buck or two on versions that look the same but have plastic ball bearings. Small and portable means that you can get a quick workout in anywhere! Very light, the whole package weighs just 3.6 ounces. The cable is 10ft long, and easily adjustable to whatever length fits you best. This is a strong and sturdy wire rope (with a strong, protective coating), so wire cutters may be needed if you desire to cut the rope after adjusting the length. Perfect for Cross Fitness Training, Boxing, Endurance Training & General Cardio