Entertainment / Tennis / Pressureless Ball: A special type of tennis ball that does not have a core of pressurized air as standard balls do but rather has a core made of solid rubber, or a core filled tightly with micro-particles. Quality pressureless balls are approved for top-pro play generally, but pressureless balls are typically used mostly at high altitudes where standard balls would be greatly affected by the difference between the high pressure in the ball and the thin air.
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Entertainment / Bowling / Junk Ball: A ball thrown with little rotation and little power. MORE
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