There are many different types of shuriken. Here, we can see the flatter version and even here, there are many different characteristics. These can be even used to pry nails, to pick locks, where you have many, many different uses. We're not just restricted to a throwing implement. This could have even been attached to a chain, maybe on the end of a weapon. So, just this and use, in that fashion and of course, you've got the o shuriken, which is sort of a, more of a nail shaped throwing implement, that can be used to just throw at, your attacker. So, just a small sample of the different variety of shiruken, that are prevalent in traditional Japanese martial arts.