Slackers 40&rsquo;  Zipline Falcon Series Kit with Seat Strong Steel Trolley With Sealed Ball Bearings Maximizes The Strength And Speed Of The Ride Allowing For Hours Of Enjoyment Fully Assembled Trolley And Very Thorough Instructions Decrease The Setup Time So You Will Be Zip lining In 30 Minutes Smooth And Consistent Speed With A Gradual Stop At The End Allow For The Best Backyard Zip line Ride With No Brakes Needed Colors May Vary Strong steel trolley with sealed ball bearings maximizes the strength and speed of the ride allowing for hours of enjoyment Fully assembled trolley and very thorough instructions decrease the setup time so you will be ziplining in 30 minutes Smooth and consistent speed with a gradual stop at the end allow for the best backyard zipline ride with no brakes needed Colors may vary