A jump rope designed and built to be the last you'll buy. The handles are machined out of solid 6061 aluminum or 304 stainless steel. The heavy duty PVC cord has a string at the core to prevent stretch. It's made specifically for jump ropes with the perfect balance of weight and rope diameter. The inside edges of the handles have a precise fillet to hold the rope at a tangent as it spins around you. The stainless steel handles have some serious heft, each handle weighing 500 grams (1.2lbs). The heavy handles with the 6mm rope make for a perfect heavy duty workout rope. The aluminum handles weigh 185 grams (0.4lbs) each.