100 Used Tennis Ball  These balls were played with indoors on har-tru courts (gray clay). The condition of the balls is they are clean but mostly dead. They are perfect for teaching tennis beginners because they are easier to hit than live balls. Summer camps love to buy these balls by the hundreds. Please email me with any questions that you might have. But they are prefect for just about anything. Sports, chairs for the classroom, dogs, crafts, and anything else you can think of.