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Dyna Bee develops grip, wrist and forearm, improves your grip for golf, tennis racquetball, any sport, it's a self-contained mechanism requires no special care. Dynamically balanced gyro ball-capable of spinning over 8,000 RPM. Outer shell made of same space age polycarbonates used by astronauts. Completely independent gyro requires no batteries, strings or other external equipment. Comes with instruction booklet.