Nanban Chidori Gane were used by the Ippon Ryu
Made with a steel tube that has a chain that slides in out and out to produce a flail with wind blade (not sharp) on the end.
The chain can be pulled inside to hide it. the stopper made from horn can be slide up the cord to lock the chain inside the tube
The weight is thought to resemble a bird in flight.
The tube has a lacquer black finish