1High quality rubber used as coating, to ensure ball elasticity, stability and durability. 2The outer layer is made of high quality chemical fiber, greatly improves the wear resistance of the ball surface. 3Tennis is standard in size and diameter, specially used for training and competition, and basically suitable for all kinds of fields. 4Small size and lightweight, easy to carry and store, convenient to use. 5Suitable for tennis competition, tennis training, or using it for your pets.