Read more about his and many other superheroes' martial art shopping habbits in "The Science of Superheroes"Though not exactly a part of his Utility Belt, Batman's silken rope was another on of the Dark Knight's most powerful tools. Equipped with a grappling hook (easily bought for under $30 at most stores handling mountain climbing gear, as well as many internet shops that specialize in ninja accessories), the slender line offered Batman a silent and secret method to scale buildings without being seen by his enemies inside.