The Dunlop Championship High Altitude 24 Cans of tennis balls are designed for play at an elevation higher than 3,500 feet, as opposed to lower elevations which do not require a specialized ball.
Answered on 6/9/2012 by Community Answer from None
High altitude balls are specially pressurized for play at elevations higher than 3,500 feet. Since the outside air pressure is lower at high altitudes, a regular tennis ball will bounce higher when used at altitude.
Answered on 6/11/2012 by Ryan from Holabird Sports
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