12gauge dog-collar

I stumbled over some interesting dogcollars on the daily quest for google-inspiration. There was this company selling dogcollars with (fake)12gauge cartridges. Well I figured it be kind of cool to use real used ones instead, like souvenirs. So as you can se each one of these has a little 'crater' in them after being fired, didnt even need to use rivets, just hammered them as they were.