Moose's Mighty Beanz

I do not understand one little bit what these little Moose's mighty beanz are all about. They are just a little capsule of plastic with some heavy object inside of it that can move back and forth. I bought a package of 6 the other day at Wal-Mart because they were on for like 50 cents in a clearance bin. I thought that when you dropped them or something they would bounce but they don't. From what I can tell they are more of a collectors item type of thing. Can't really understand it. If anyone knows what it's all about let me know.