Jump Ropes by Tiip &ndash; Super Kryptonite Strength - Experience a workout that Benefits your heart &ndash;  #1 Favorite of Professional Boxing Centers, Gyms & Team USA - With Free eBook Exercise Manual &ndash; 100% Lifetime Money Back Guarantee Jump Ropes by Tiip are designed for all age groups and skill levels. Start your exercise & fitness program with ease and confidence. Durable solid rubber rope construction, weighted center spring helps guard against wear and tear when the rope hits the ground. Precision Steel bearings designed to prevent tangling of rope, making the rope spin easier which reduces the stress on wrists, elbows, and shoulders. Quick & Easy to Adjust  No need for wire cutters, a normal pair of scissors can be used to cut the rope to your desired length. Air Grip Foam Handles; contoured specifically for comfort and gripping ability. Free eBook Jump rope Manual, which provides a workout routine for beginners  100% Lifetime Money Back Guarantee