Used Hard Tennis Balls - 60 Balls Dunlop Mostly st. James, with FORT making up about 20-30% Used for two hours on an all-weather court (women's doubles), then stored at home. I play tennis almost every day, so the balls include some opened about a month and a half ago, but they still have a decent amount of air. I will select and send balls in good condition. Suitable for practice balls, for those who are concerned about air pressure. Even if time passes after listing, I will replace the balls, so the condition of the balls will not change. Although they look the same, I am also selling 80 balls that have become softer after 2-3 months at a discounted price. Suitable for... Soft Tennis Suitable for... Hard Tennis Type... Pressure Balls