A Japanese ninja's traditional arms, a shuriken.
This was used as an old arm.
However, now, it is not used as arms.
Since the tip is sharp, it is dangerous.
I would like for you to become prudent in handling.
Please do not throw toward a person, an animal, and the thing to depend on what kind of means.
It decorates with a place like things.
It is the qualification only for those who can follow a shuriken there at acquisition and this rule, and he is a real ninja.