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643.0329 pennyweights is about one-and-three-fifths times as heavy as a Basketball.
In other words, it's 1.60340671170 times the weight of a Basketball, and the weight of a Basketball is 0.623672080640 times that amount.
(NBA official ball standards, Size 7)
A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 401.04166667 pennyweights. These balls have 4,118 pebbles each with a diameter of 2.5 mm
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