... : Black, White, Blue, Yellow, Red, Transparent Brand: Power Balance Condition: New Size: S(17.5cm),M(19cm),L(20.5cm),XL ... Origin: China(Mainland) Product Features: Improves Flexibility Better Balance Longer Muscle stamina Worn by many pro athletes Increased Core ... generator it was designed to be, resulting in immediate improved balance, increased core strength, greater flexibility, increased range of ...