Jump Rope - Speed Jumping Rope for Exercise, Double Unders, Cross Fitness, Boxing, MMA - 100% Lifetime Guarantee STRONG STEEL TIP: Industrial-grade smoothed STEEL tips make the rope spin much smoother and faster. EXTREMELY LIGHT: One of the lightest high-speed jumping cables on the market. You will notice a difference. MELT FAT: Burn up to 1,000 calories per hour while doing cross fitness WODs, boxing exercises, or MMA training. PERFECT FOR ALL: Designed for total beginners as well as cross fitness and boxing speed masters. LIFETIME GUARANTEE: This will be the LAST jump rope you will need to buy. We guarantee the quality for life.