Pro Penn Marathon is Penn’s longest lasting tennis ball featuring exclusive Encore™ Technology for a 22% longer lasting core and high tenacity LongPlay® Felt for extended play. Pro Penn Marathon is the official ball of PTR because of its guaranteed longevity, durability and visibility. Pro Penn Marathon is available in Extra-Duty Felt (fo
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A guaranteed purchase I make at the opening of the outdoor tennis season. Reliable consistent quality, no surprises.