1、 Durable material: The tennis ball is made of ultra-durable chemical fiber material, which can be used for a long time. The tennis ball comes in a small bottle for easy transportation and storage. 2、 Never lose elasticity: regular tennis balls will flatten over time, even if you don't use them. These balls will have the same consistent bounce over the life of the ball. 3、 Multi-purpose: The diameter is about 6cm, suitable for training children, also suitable for playing tennis machines, tennis practice, and even playing with your pet. 4、 Package content: Each bottle contains 3 high-quality tennis balls, which is convenient for alternate use. 3 * Tennis Balls Material: chemical fiberColor: yellow-greenSize: about 6cm in diamete