They make you invisible, stronger, smarter and younger. LOL.. Just kidding. I really depends who you ask. If you ask my wife she'll say that it helps her sleep. She had back suregery about six years ago and has had a lot of back pain since. Now she sleeps a lot easier. If you ask my brother he'll say that it helps with his lack of balance. If you ask me, well I'll say I'm not really sure sure, but they look cool.
They are silicone wristbands with two magnets on opposing sides that are supposed to interact with the human bodies electrical currents, but I don't know if they really work or if people believe they work so they work. Can't really call it.