EChampion Sports Tennis Ball Pack of 3 - 2.50" - Yellow - 3 / PackE ETrain with this practice tennis ball to improve and develop your game. Durable construction can be safely used on all court surfaces. Bright color is easy to see and stands out during use. Nonpressurized design prevents the ball from going flat over time for lasting use. Tennis ball is perfect for running drills, practice sessions and more.