A Zip Line needs two anchors, usually these are trees at least 1 FT in diameter. Connect the cable between the trees, add the stop block and trolley, connect the seat or harness or both and zip, zip away. We have three basic categories for our zip lines: Seat Style are all less than 200'. These kits include the Hornet Kit (1/4" cable), the Spring Stop Kit (1/4" cable & the Airtime Kit (3/16" cable). Next is the Torpedo Kit, which is in a class all it's own. This comes in lengths up to 500' of 5/16" cable and includes a harness, seat and bungee brake. Finally, we have the bare bones DIY Cable Kit, if you wanted to build your own kit from the basics on up.