Coach Ryan's testimonial:  "The Dunlop Grand Prix tennis ball is my favorite ball.  The ball maintains its bounce for the duration of the lifespan.  The impact when hitting the ball is very plush.  I highly recommend this ball for seniors or players with arm issues.  The ball feels soft yet bounces high.  It is a great cart ball for feeding balls.  Dunlop is the official ball of the ATP tour and ITA (college) tennis.  We are the only place in town that carries this ball.  Come check us out!"