Correction for the size of a Basketball
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How big is 15,900 drams?
It's about eight-and-a-half times as big as a Basketball
The size of a Basketball is about 1,921.77716590 drams.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 1,921.77716590 drams. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.