A set of 10 incredible First Tennis Balls, which are inflatable and very easy to use. These balls are perfect for beginner tennis programs for children. These balls are addictive and will make children love to play tennis. Success and Fun will be reached immediately from the first ball hit. You can best use that ball with children 2-3-4 or 5 years old.Invented and produced by Jean Fleurian (Davis Cup player) for Le Petit Tennis programs. the Size is 8 inches (15cm) inflated. These balls have a 90% slower bounce compared to regular tennis balls. They can be used on 36ft tennis courts or smaller. Balls are in Orange color. The pack comes with a handy pump. (Note: the needle of the handy pump is located in a hidden compartment of the handle of the pump)