Best Bounce Performance: Our tennis balls feature a thickened rubber core for a perfectly balanced bounce. These balls have the same consistent bounce throughout the life of the ball. Perfect for tennis lessons and dogs playing on the grass.Premium Material: The tennis ball is made of high quality rubber and felt. Soft, tear resistant, anti-pilling and durable. Plus, it doesn't contain any harmful ingredients that are completely harmless to your dog's teeth. Lightweight and harmless, it's perfect for kids and adults.22-Piece Set: Package contains 22 tennis balls, enough for your training needs or as a spare. Perfect for parties, large group outings or group teaching. Bring your tennis ball to the tennis court or playground for a big game.MINI SIZE FOR PORTABLE: Each mini practice ball is approximately 6.4cm / 2.5 inches in diameter, easy to carry and store, allowing you to easily store it in pockets, backpacks or even pockets, very durable.Wide Use: These durable exercise balls are Not only great for tennis practice, lebound or machine practice, large group training, group lessons, but they also make great fun dog toys. The bright yellow tennis ball is easy to attract the dog's attention, and it will run and run, which is more fun.Specification:Material: Rubber and Felt Diameter: 6.4 cm / 2.5 inchesElasticity: approx. 90 cm (free fall from a height of 2.54 meters) Green colorProduct weight: about 1430 g. Package contents.