Fast Track Tennis Replacement Balls - 12 Pack | High-Performance Practice & Match Tennis Balls for Training, Coaching & Recreational Play

Re-closable mesh bag with one dozen (12) long lasting, pressureless, orange-colored balls with six (6) black dots per ball.  Our pressureless balls are ideal for practice and are the same dimensions as standard-size tennis balls that come in a can.  Uniquely marked for enhanced visual tracking and specifically designed for use with the Fast Track Tennis smartphone app,  Fast Track Tennis balls enable sophisticated computer vision algorithms to measure ball speed, rotations per minute and virtual landing position.

Replacement balls are available in quantities of one dozen (12 balls) or more.