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by Jonathan Vatner | April 27, 2010

Wrist ballOnce the gyroscope inside this translucent plastic ball starts spinning, it becomes harder and harder to hold the ball, making it great for strengthening the hand and wrist. TBD Promos (yes, that's really the company's name) sells it for $6.50 to $9.50 for a minimum of 1,000 units; add-ons, like a speedometer or a light, are available. (626) 698-1183; tbdpromos.com