... Colors: Black, White, Blue, Yellow, Red, Transparent Brand: Power Balance Condition: New Size: S(17.5cm),M(19cm),L(20 ... stamina Worn by many pro athletes Increased Core Strength Product Description: POWER BALANCE bracelets contain two Mylar Hologram's which ... it was designed to be, resulting in immediate improved balance, increased core strength, greater flexibility, increased range of motion and ...