The Pro Penn Marathon is Penn's 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. Extra Duty felt for hard courts. High Altitude ball for use over 3500 ft.
3 balls per can.