Dr-ion Reversible Negative Ion Wristband Black Medium (7.5 in / 19 cm) - Constructed from the highest grade silicone on the market, the original Dr-ion wristbands contain the proven presence of negative ions in each piece, i.e. more than 2200 negative ions per cubic centimeters. Encased in a clean acrylic case inside a luxurious golden wooden box, the reversible wristband features the Dr-ion logos on both sides. As a perfect companion for your daily activities, the Dr-ion negative ion wristband is also a perfect gift for people you really care about. Also called Power Wristband/Bracelet, Energy Wristband/Bracelet or Health Wristband/Bracelet, the Dr-ion's negative ion wristband/bracelet is ultra light, very flexible, fashionable and reversible.