Penn Pro Marathon Extra Duty Tennis Balls (1-Case)

Balls by Penn. Details:The Pro Penn Marathon is Penns longest lasting tennis ball. Features Encore Technology for 22% longer lasting core, high tenacity LongPlay felt for extended play, and Smart Optik felt for optimum visibility. Pro Penn Marathon balls are the choice of USPTA pros due to its durability, longevity, and visibility. Convenient case for frequent players.