Just about anything hefty can be used. I once read a self-defense article where the author was praising the ordinary rock as a thrown weapon. He mentioned having seen 8-year-old girl softball players bring a full-grown man to his knees with a stray softball. He said imagine the impact from an adult throwing one. He recommended hanging a large rug from a clothesline to use as a target to practice on. He suggested a few good-sized ones could be carried on the person. With practice they can be quite effective. They’re also immune to metal detectors. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />