Power Balance Pro Ion Silicone Wristband For the first time Power Balance is bringing together its hologram and new ion technology. The PRO ION wristband includes natural ions so you can bring a little bit of natures essence into your life every day. Good or negatively charged ions are produced by certain naturally occurring minerals and Power Balance has incorporated a special blend of these into the inner white layer of the new Power Balance PRO ION bands. Available Colors: Black, Blue Available Sizes: XS, S, M, L