Pro Penn Marathon RD Tennis Balls are ideal for tournament play on clay tennis 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 RD is the #1 choice of the USPTA Teaching Pros because of its guaranteed longevity, durability and visibility. The Pro Penn Marathon RD is available in a 72 ball case.
Regular Duty designed for clay court use