Tennis Ball and Elastic Strap For "Tennis Trainer" Size:Unique size and smoothed stainless steel brake

and smoothed stainless steel brake cable for less friction

Available in one size

6 mm quick-release seat clamp

effective training sessions

or for staying active while on the move

Tennis Ball and Elastic Strap For "Tennis Trainer" Size:Unique size and smoothed stainless steel brakeOur design teams developed this product for learning to play tennis on and off the court, on your own or with others. A NOTE ON BALL DURABILITY For adults with an intermediate level, balls wear out after a few hours of play. Professional players change balls after every 9 games. We've taken great care to produce balls of the highest possible quality, but even so, they can still withstand only a few hours of intense play. Ball The ball used is an