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Is 489.450 monme (匁) as heavy as a Basketball?

It's about three times as heavy as a Basketball
The weight of a Basketball is about 166.317202330 monme (匁).
(NBA official ball standards, Size 7)
A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 166.317202330 monme (匁). These balls have 4,118 pebbles each with a diameter of 2.5 mm
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