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250 grams is about one-and-a-half times as heavy as a Billiard Ball
In other words, it's 1.5336505195470 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.652039031874990 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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