Tennis Ball, Stress Ball or Digiflex Exercises - 1-HP
2.5" Stress Mini Tennis Balls - Custom printed Tennis Ball Stress Relievers with your logo, graphic or message - MiniSportsBalls.com
20 Pieces Mini Stress Balls Foam Sports Balls for Boys Girls, Includes Basketball, Football, Baseball, Soccer, Tennis, Volleyball Foam Balls for Stress Relief, Party Favor Toys, Ball Games(Football) - Walmart.com