Pro Penn Marathon XD 3B Case

The Pro Penn Marathon is the official ball of PTR because these qualities are certain to be long-lasting, robust, and visible. With proprietary EncoreTM Technology for a 22% longer lasting core and high tenacity LongPlay® Felt for extended play, Pro Penn Marathon is Penn's longest-lasting tennis ball.

The most technologically advanced tennis balls are Penn's Professional tennis balls, which provide players the best core and felt technology and enable the ball to play at its peak for longer periods of time.