This is the California At Berkeley Power Force Ionic Power Bracelet! Power Force Ionic Apparel is the official sports band provider for California At Berkeley, providing officially licensed products bearing California At Berkeley's logo and colors. While Power Force makes no medical or scientific claims, negative ion technology can be found in all Power Force products. The pride that comes from athletes and fans supporting California At Berkeley with Power Force products is beneficial to everyone that wears them. Support California At Berkeley 365 days a year with Power Force Apparel. From the gridiron to the court, the backyard to the stands, Power Force is helping athletes and fans represent their school with pride. Choose from 2 sizes 7 inches for women or kids; 8 inches for Men.