Yes, they do work! My daughter swears by hers .. she wears it to track practice. I've had back surgery and since I've started wearing my Power Balance bracelet, I have had no back pain!! Before wearing one, with any weather change or if I was tired, my back would ache!!
You send me your mailing address. I mail it to you. Upon receipt, you leave feedback saying that the item arrived and you were pleased with the transaction. I leave you good feedback too. Good luck!