Penn Pro Marathon Extra Duty Tennis Balls (3 Ball Can)

AMERICA'S #1 SELLING BALL: The result of 100 years worth of testing and perfecting; Penn is the standard by which all other tennis balls are measured. LASTING DURABILITY: 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. ALL COURTS: While extra duty tennis balls are best suited for hard court matches, they can also be played on all indoor and outdoor softer, clay court surfaces as well. USTA APPROVED: Penn Tour balls are approved by the PTR so you're sure to be playing with a high quality and consistent ball. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.