ELITE SURGE Jump Rope For CrossFit Double Unders - Versatile Cable Speed W/EBook  Fully Adjustable Length For All Sizes HIGHEST QUALITY HANDLES: Machine-cut, high-grade anodized aluminum handles (patent pending) with dual ball bearings. The two ball bearings surround the cable (one on top and the other below) reducing the friction on the cable so the rope spins more freely. This gives the rope an incredibly balanced feel as you spin the cable. KINK RESISTANT CABLE: Our 3/32" nylon coated speed cable is made in the USA. This cable is for indoor use. Most other ropes on the market are using PVC coated cable which wears out twice as fast. IMPROVE DOUBLE UNDERS: Designed by a champion speed jumper to improve your double under skills. The large cable hole allows for a variety of cables to be used to meet each jumpers needs including 1/16" bare wire for competitve speed jumpers, 1/8" heavy cable for outdoor use or jumpers who like the feel of a heavier rope (purchased seperately). GUARANTEED SPEED: Patented Dual-ball bearing ultra-light weight 4oz aluminum handles spin 7+ jumps a second. Designed and engineered to be the fastest rope on the market and to create its own turning momentum as it turns. (Patent No. US 9,427,613) GREAT FOR FITNESS: Top-end fitness jump rope popular among athletes looking for a little extra edge. The Elite Surge was widely used at the 2015 National and World Championship of Jump Rope. Unparalled training tool for boxing, muay thai, cross fitness, and more to improve speed, agility and strength. This is the rope of choice among the best jumpers in the world.