| 摘要 |
The device of the present invention is substantially disk-shaped having two flat sides lying in parallel planes substantially one-inch apart and a circular profile with a circular perimeter surface connecting the two circular flat sides. The device is molded from a urethane material having a durometer hardness of approximately 60. When used as a training device for softball pitching, the device will have a 12'' circumference, a 3.75'' diameter, a thickness of 1'', a weight of 6.25 ounces and a pair of molded seams on opposite sides of the circular perimeter; two seams being 1.5'' apart and two seams being 3'' apart.
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