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4,800 grains is about one-and-nine-tenths times as heavy as a Billiard Ball.
In other words, it's 1.90807453416150 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.524088541666660 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 2,406.250 grains and 2,625 grains. 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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