Diameter: 2.58 Inches; Bounce Height: About 135cm. Package Includes 60pcs tennis balls and comes with a reusable bag. Take it and Retrieve the balls conveniently.This tennis ball is made from natural rubber and durable felt material for consistent feel and reduced shock. To ensures the all courts tennis balls will play like new for as long as possible, not easy to get broke in normal use.Our tennis balls can not only be a great tool for a pro tennis teacher,but also great for family fun and use for signature. Even the ideal way to have fun anywhere and even play with your dog or pets.If you have any quality problems with our tennis balls, please feel free to contact us and we guarantee to solve it until you are satisfied. Replacement or other solutions will be provided for you.