I read that, the balls i have are just like a tennis ball but white and there are no caps on it. It looks and feels just like a tennis ball, its sown together and no way of opening it.
I just bought http://www.homeofpoi.com/shop/productDetails/Pair-of-LED-GLOW-sock-POII am either an idiot or i was sent the wrong balls with these socks.They look just like a whie tennis...