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Grapple-line is a length of monofilament wire attached to a spool, and concealed within a special compartment on Ryūken Senju's belt. It is used primarily for scaling the sides of buildings and ensnaring targets. Although not the most glamorous item in Ryūken's arsenal, it is doubtless one of his more useful tools, and comes in handy when rooftop patrolling is more expeditious. He has upgraded the rope in recent years to include a spring-loaded delivery system, and a grappling hook attachment. He also has a magnetic gas-powered Grapple Gun version of this line. Magnetic and tested for 500 pounds, the grapple gun is holstered on the left side of the belt. He once used it to pull a criminal out of his vehicle. And, he lastly used it to escape the prisoners while they were beating him up.