Attaches to zip line to gradually slow down the rider as a back-up brake substitute for a properly set-up zip linenNew 15 foot deluxe bungeez shock cord (with uv-protective reinforced cover-resistant sleeve) attaches to reinforced anchor bag and high density polyester block. We suggest filling anchor bag with approximately 100 lbs of sand (not included).nNew reinforced sleeve protects rider and spectator from potential bungee cord snapping or breakingnDesigned to be used only with Slackers brand 40u0026#39; - 100u0026#39; zip line kits. (Do not use on zip line course over 100 feet or on steep zip line course that has too much tension.)nZip line cable must be taken down to install brake kit. It was designed to have minimal hardware to reduce possible hand scrapes and injuriesnCreate an outdoor adventure in your own backyard with brand name internal/b4adventure's zip lines! this newly designed deluxe bungeez brake kit, released just in time for holiday 2016, has an orange protective barrier sleeve that does not allow breakage, ensuring additional rider safety. This brake kit can be used in combination with any of our zip lines and includes a 15' bungee shock cord with a reinforced sleeve, ABS block, anchor bag, and instructions. Attach bungee cord to anchor bag to slow down zip line rider. Bag holds 100 lb. Sand bag (not included).