The 3 meter PVC coated steel wire is fully adjustable using a tightening/loosening mechanism on the head stock of each handle. *Incudes a Free Setup Adjustment Guide with 13 examples of Crossfit workouts that involve Double Unders. (Emailed on request) Want to increase your WOD times or perfect your double unders? Durable – High quality materials and build quality Super Fast – Cuts through the air! Travel Friendly – Small and compact to throw in your gym bag while travelling!