Pressureless Balls
Traditional pressureless balls usually have a stiffer, woodier feel than pressurized balls and do not bounce as high as brand new pressurized balls. Unlike pressurized balls, though, they do not lose bounce over time. In fact, they get bouncier as they get lighter, due to fuzz loss. The balder they get, the more their flight, bounce, and spin responses change from what you would expect of tennis balls.
More advanced pressureless balls, such as the TreTorn MicroX, are more similar to the feel and play of pressurized balls, and last many times longer than traditional tennis balls.
Read more about this topic: Tennis Ball
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