Lacrosse ball

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According to the 2004 NCAA men's lacrosse rules [link], a lacrosse ball must be white, yellow, orange or lime green solid rubber—between 7 3/4 and 8 inches in circumference, between 5 and 5 1/4 ounces in weight and, when dropped from a height of 72 inches upon a concrete floor, shall bounce 43 to 51 inches at a temperature of 65° to 70° Fahrenheit.

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