The Penn(R) Pro Penn Racquetballs are some of the most widely used balls in US and Worldwide tournament play. Long-lasting, each ball features Encore Technology(R) for durability, while a bright green color has great on-court visibility. The consistent speed and playability make Pro Penn balls the choice of players who know that the ball matters. FEATURES: Encore Technology has a unique core compound of natural and man-made polymers to produce a core that limits ball softening Long lasting LongPlay(R) felt lasts 25% longer than original Pro Penn and stays cleaner on court Smart Optik technology adds greater visibility Three ball can Model: 551840