After seeing the Cancer Zodiac slingshot I had an idea. What if the handle was a pair of "brass knuckles" that you put your fingers through. It could then be used as a secondary weapon. Just a thought.
I protected my boxing bag and gave it a punch with <a href="https://lh5.googleusercontent.com/-UCpcXKQkaYk/UAP26D2B3cI/AAAAAAAAAeI/LS8WTCAzb6c/s640/16072012004.jpg" class="postlink" target="_blank" rel="nofollow">THIS</a> one. And as Joerg said, it hurts a little bit. I didn' t hit hard like i do with boxing bandages and if i do i probably will break my hand( and the boxing bag). I have this brass knuckles for years now and never used it and never took it with me.