Used tennis balls. 30 balls total, including 16 DUNLOP St.JAMES balls. Used for practice on an omni court for 2 hours a day, on weekends, for 12 weeks. Since everyone shared the balls, there are various brands. The felt is not very worn, and the air pressure is slightly low, but the feel when hitting is still good. They can still be used for serving and feeding balls. ★The Yonex balls were used for games, so the feel is very good. Please purchase only if you understand that these are used balls.