Mastered double unders?? Or just enjoy skipping? The Nike speed rope is made from (38%) polypropylene (18%) rubber (4%) ABS (40%) thermoplastic polyurethane. Coated polyurethane rope / Swings smoothly with less effort. Soft contoured grips Uncoils easily and resists tangling Adjustable length / Fits users up to 66 (198cm) tall.