Especially designed for beginners or children learning how to do double unders. Because it is a little slower than the cable speed ropes, it does not cause pain when missing. Solid-core extra thick 5mm PVC cord. Each rope comes in 9" 6" foot length. Very easy to adjust length. Perfect for the jumpers who who want speed and fun. Unique handle design allows the rope to turn with no friction in the handle, which means the cord will never break at the handle. Crossing moves also work well with this rope. Unbelievably fast. Original Design with 2 year guarantee on handles.