Pro Penn Marathon XD Tennis Balls are ideal for tournament play on asphalt or concrete hard courts. The Pro Penn Marathon XD 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. The Pro Penn Marathon XD is the #1 choice of the USPTA Teaching Pros because of its guaranteed longevity, durability and visibility. The Pro Penn Marathon XD is available in a 72 ball case.
X-Duty designed for Hard Court Use