Thank you very much for your many follows and repeat purchases. In the unlikely event that you are not satisfied, we will offer a refund or exchange within 30 days of product arrival, even for reasons of customer convenience. We hope you can purchase with peace of mind. As an initial bonus, we are offering an additional ball service. We also have repeat customer benefits. We would be delighted if you would take this opportunity to use our services. These are balls that were opened in early January and used for one week in a women's practice session with a hard court. As you can see in the images, the felt has some scuffing. Also, the air pressure will decrease somewhat over time. These are recommended for service practice and for practice sessions where many balls are used. We believe they can be widely used by children, women, and adults, as well as by beginners and intermediate players. We will respond promptly even if you purchase immediately. We have approximately 200 balls in stock. If you purchase a large quantity, we will offer a significant discount, so please contact us before purchasing.