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0.310 kilograms is about one-and-nine-tenths times as heavy as a Billiard Ball
In other words, it's 1.90172664423820 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.525837928931460 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.15592237718750 kilograms and 0.170097138750 kilograms. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
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