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 if it is due to your convenience. We hope you can purchase with peace of mind. As an introductory offer, we are providing an additional ball service. We also have repeat customer benefits. We would be delighted if you would take advantage of this opportunity. These balls were opened in early January and used for one week in a women's practice session on a hard court. As you can see in the images, the felt has some scuffing. Also, the air pressure will decrease slightly over time. These are recommended for service practice and drills that require many balls. We believe they can be widely used by children, women, adults, and from beginners to 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 ♪