Our tennis balls are made of natural rubber and durable felt materials, providing a consistent touch and reducing vibration. Perfect for tennis machines and practice. To ensure that tennis balls on all courts can be played as new for as long as possibleand are not easily damaged during normal use. The package includes 18 packs of tennis balls. Diameter: 2.58 inches; Bounce height: approximately 135 centimeters. [Reusable tennis bag] comes with a reusable mesh bag with a sliding drawstring lock. You can bring tennis balls to the court or store them conveniently at home. Our high-quality and durable tennis balls are perfect for teaching professionals, mentors, and beginners, and can be used for various courses and exercises. Our tennis balls are not only a great tool for professional tennis teachers, but also perfect for home entertainment and signing. It's even an ideal way to have fun anywhere, even with your dog or pet.