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863.50 cubic inches is about twice as big as a Basketball
In other words, it's 1.99180716250 times the size of a Basketball, and the size of a Basketball is 0.502056634210 times that amount.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 433.525903650 cubic inches. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.
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