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The Schwalbe Air Plus tube is air pressure stable. The rubber compound enables this. Less air loss and less pumping. Extremely reliable. Quality control for safe driving pleasure: Each Schwalbe tube is tested twice at the factory for air retention.Air Plus: thanks to the high percentage of pure butyl rubber, the Schwalbe Air Plus tube retains air for much longer. So you don’t need to pump up as often. Thanks to its approx 70 % higher wall thickness, the Schwalbe Air Plus is particularly robust, and thus well protected against punctures and holes.