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328 dashes is about two-thirds as as a Tennis Ball.
In other words, it's 0.6415 times the of a Tennis Ball, and the of a Tennis Ball is 1.559 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must measure 6.54 cm to 6.86 cm in diameter, for a total volume of 511.3 dashes. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
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