The high quality smooth turning fitness mad speed rope is recommended for general purpose skipping made of solid vinyl cord with free spinning easy grip low density shatter proof polyethylene handles these are the most durable speed style ropes available the cord is regularly tested by an independent research laboratory to ensure maximum flexure fatigue resistance 8ft suitable for heights under 5ft 4 9ft suitable for heights between 5ft 4 and 5ft 10 10ft suitable for heights over 5ft 11