I wish there was a brass magnet....
I know the idea of using small children was probably in jest, but keep in mind that small kids always have their fingers in their mouths, noses, etc. Not a good combination when dealing with fired casings. If we're worried about lead around a brass tumbler we should be worried evn more about children and dirty brass. Picking up the casings they shoot is one thing, but sending them to mine a range is another. I don't mean to offend anyone here, it's just the protective dad in me coming out.