Used Hard Tennis Balls - 70 Balls Dunlop Mostly st. James, with about 20-30% FORT mixed in. Used for two hours on an Omni court, then stored at home. Appearance: The ball markings are still clear, and there's no sign of wear. There's almost no dirt or stains. However, the air pressure has decreased over the past 2-3 months. These are suitable for beginners who need a large quantity of practice balls, or for those using them for other purposes like baseball toss batting, etc. I am also selling 60 balls with more air pressure than these, which look the same. If you are concerned about air pressure, please consider those as well. Use: Soft Tennis Type: Pressure Ball