Fred Marvin Big Shot Sling Shot Throw Line KitBig Shot Throw Line Kit Get your line in the tree with our arborist throw line kits. Installing your climbing line and friction saver in a tree starts with a good throw line. Give yourself a helping hand with three different throw weights. The Big Shot Sling makes quick work of getting a working line into positon. Maximize your throws and eliminate recoil with the Big Shot Slig shot. When you are finished "Flake" your line into this durable folding