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350 grams is about two times as heavy as a Billiard Ball.
In other words, it's 2.14711072736580 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.465742165624990 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 155.9223771875 g and 170.09713875 g. 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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