There is a brand of paintball's I'd like my fellow firefighter/paintballer's to know about that may be dangerous to use. There called Monster Ball's and I have personally used them before and they are as hard as a rock and leave huge bruises. I had only used them in once in the past vowing never to use them agein after droping a friend to the ground after shooting him in the spine. I hadent sayed much about them to other paintballer's untill I seen that many people are now requesting a nation wide ban because they have caused injury to some paintballer's. Also if you need more proof about Monster Ball's danger to paintballer's I've also included a link to a video that a player made after being hit in the head with a Monster Ball.