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370 grains is about two-fifths as heavy as a Tennis Ball.
In other words, it's 0.4160 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 2.40 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 890 grains. 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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