mcclain tennis

Just so you know, for just hitting around and practicing, pressurized tennis balls generally lose their effectiveness after 3 weeks to 4 weeks unless you put them back into a pressurized canister after play. These pressurized canisters work by making sure the surrounding pressure exceeds the internal pressure of the tennis ball, not allowing gas to permeate through the rubber out of the ball. Most of us are too lazy to deal with this however so we just buy new balls.