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What is the constant pressure the ball (tennis)

jtceleron2010-02-15 22:11:09 +0000 #1
Tennis ball and non-constant pressure of constant pressure the ball What is the difference?
dswinhaier2010-02-15 22:26:57 +0000 #2
a long time to maintain a stable pressure of the ball is called constant pressure the ball. Also known as non-pressure the ball, that is training bulk ball, do not need to save in a pressurized state.

Game generally do not use this ball.

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