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water polo ball
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.
==Standard water polo ball characteristics==
Ball weight is 400-450 grams (14-16 ounces) and inflated to 90-97 kPa (kilopascals) gauge pressure (13-14 psi) for men and 83-90 kPa (12-13 psi) for women.〔FINA Water Polo Rules: (Section 3, The Ball )〕〔(Canoe Polo Competition Rules )〕 Water polo balls come in two main sizes: a size 5 (68-71 cm in circumference), intended for use by men, and a size 4 (65-67 cm in circumference), intended for women. Smaller balls are sometimes used by juniors for "mini-polo," though these miniature balls do not typically come in standard sizes and are often coloured green.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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