The Powerball by Dynaflex is one of the best hand and arm strengtheners out there. Perfect for climbers, skiers, golfers, and any athlete. The ultimate in engineering design work, featuring user-friendly features and incorporating an on-board generator. By activating the gyro, a dynamism (motion) is created which will activate the LED lights located in the interior of the gyro. The faster the unit runs, the brighter the lights will be until the whole hand is engulfed in a bright glow.
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