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| | Water polo ball - Wikipedia, the free encyclopedia |
 | | A water polo ball is a ball used in water polo and canoe polo, usually characterized by a bright yellow colour and ease of gripability, so as to allow it to be held with one hand despite its large size. |
 | | Water polo balls come in two main sizes: a size 5 (0.7 meters or 28 inches in circumference), intended for use by men, and a size 4 (0.65 meters or 26.5 inches in circumference), intended for women. |
 | | In 1936, James R. ("Jimmy") Smith, California water polo coach and author of several books on water polo mechanics, developed a ball made with an inflatable bladder and a rubber fabric cover, which improved performance. |
| en.wikipedia.org /wiki/Water_polo_ball (454 words) |
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