These are brass knuckles that aren’t made out of brass, and also aren’t legal in most states.
The Blast Knuckles are shaped like brass knuckles, but consist of a rubberized hand grip with two electric diodes on the outside – where one might make contact with an assailant.
At contact, 950,000V of electricity course through your victim. And, here’s the best part: “aiming is as easy as punching.”
Get them for only $50!
Source: The Sportsman's Guide