Correction for the size of a Tennis Ball
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How big is 2,597 pinches?
It's about ten times as big as a Tennis Ball
The size of a Tennis Ball is about 255.60 pinches.
(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 255.60 pinches. 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.