What is this hand to hand weapon called? Kind of like a koga.

Question

Kind of like a koga, but shorter. A lot of people use a roll of quarters or nickels, but I know they actually make some. What are they called?

Answer 1

I've just heard it called a fist pack.

Answer 2

That's a kubotan which is a nifty little weapon that you can use for punching and striking with as well as applying some wrist locks and a few other types of restraining and control type techniques.  

Answer 3

Brass knuckles?

Answer 4

You do know that there illegal don't you? There called "Pennie Wrap's or they used to be because you went to a post office and the change you got was in a tube and wrapped with tape. By the way,they don't have groove's for the finger's because they are pretty primative and just to add to what I've already said, if you are caught with it you will be arrested and charged for carring an offensive weapon.