From Alien Flier LLC The Alien Flier online store features our unique backyard zip line products and accessories. We bring adventure to your backyard by providing all-season outdoor fun for your entire family. Alien Flier zip line kits are easy to put up and take down and come in a variety of lengths. With ground-level entry, platforms are not required - the seated rider is towed to the top. Each kit also includes a bungee braking system. All trolleys come standard with our patented rider-activated Speed Control to slow the rate of descent. Put some zip in your backyard playground, challenge course, or bring it to your summer outing or party. Alien Flier Backyard Zip Line Kits are also available on Amazon and Ebay.