Quote:
Originally Posted by coachrick
Ba-ZING-a!
Unless things have changed, it's ambient air in most balls. Gamma used to put nitrogen to slow the pressure loss, but I don't know if that's what they do currently.
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i thin you are right. it is liquid nitrogen
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Babolat Pure drive 2012, 55 lbs, Kirschbaum Proline X / X-1 biphase. Nalbandian backhand and Nadal forehand.
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