Ninja biken, Sinobigatana, Ninja to?

Although it is hard to say which is actually a real name for this type of sword, he is become not replaceable in training of Ninjutsu.

 

This type of bokken I we make the past ten years, what you could see below is the latest improved version,  in fact, several of them, never do just one solution : ))

and  surprise under Kashira, metsubishi : )