The Manriki Gusari was a chain usually about 3 feet long, and weighted at both ends. It was developed as a self-defence weapon but was also a wicked offensive weapon in the hands of a ninja. It was small and easily concealed in the palm of the ninja's hand, or in a sash.
While holding one end of the chain, the Manriki Gusari could be swung around and used as a whip. The weighted end could cause a great deal of damage.