Overview The Pro Trolley is a zip line trolley made for serious use and can easily handle 5/16" - 1/2″ lines. Includes revolutionary Speed Control braking. Features Speed Control braking Pull back on the handlebars to slow down or stop Push handlebars forward to resume full speed No replaceable parts! - Braking is done using high-quality heat-treated rollers bicycle-style handlebars keep the rider stable and facing forward Adjustable handlebars high quality sealed bearing rollers for a smooth fast ride Designed to be easily mounted and unmounted from the zip line Made in Oregon USA Specifications powder coat finish 12 gauge steel body Stainless steel, heat-treated rollers 2 sets of sealed, ABEC 7 precision bearings Certification: ISO 9001 supports 500 lbs weight 8 lbs