Camp Flyte Double PulleyCamp Flyte Double Pulley Linear double pulley specifically designed for crossing cables and zip lines. Linear double pulley specifically designed for crossing cables and zip lines. Sealed ball bearings for low friction and high speed (max 20 m s). Aluminum alloy main body and stainless steel wheels. Accommodates ropes up to 13 mm and steel cables up to 12 mm in diameter. Large main attachment hole and secondary connection point on top. Inner Sheath