I don't think they are too bad, if you train reasonably. I practice with some very hard plastic (acrylic I think) nunchuks. They could easily break a bone, or crack a skull I'm sure. I've never done anything more than hit myself in the elbow. It hurts like hell, and I can't bend my arm for a while, but I've never gotten anything worse then that. Once you learn the basics, which you can practice slowly, it would be very difficult to hit yourself anywhere other than the elbows (maybe knees). There are foam practice ones as well, but they are way too light, I don't really recommend them, a friend filled the inside of his with silicone to make them a little heavier, but they were still pretty light.. Staff is fairly good weapon to start with, and sword isn't bad either. Nunchuks are grea too. I'd really love to learn Rope-javelin and 9-section whip chain (I have one, but practice with an extension cord, because I'd be likely to kill myself otherwise).