Ideal for soft courts, the Pro Penn Marathon Regular Duty tennis ball is Penn features the newest technology in Penn tennis balls. Penn has introduced Encore technology, which features a more durable core and LongPlay felt. The Optik felt is brighter than most tennis balls giving great contrast against the court.

- Penn’s Professional Balls are the most technologically advanced tennis balls providing players with top of the line core and felt technologies that allow the ball to play at its best for longer periods of time.