The balls being sold here are the 'A-B' Quality balls from GreenShoesUSA.com. They have been washed (they are clean), and are precut (Y shaped cut) to fit nice and snug on the bottoms of school chairs. They are top quality tennis balls from Wilson, Penn and Diadem.  They are now being recycled so that they can have a 2nd purpose on the bottoms of desks and chairs to protect floors (thus reducing maintenance) and quiet classrooms.  These precut tennis balls are very popular with schools as they are very durable (last for years), are well priced, they reduce floor maintenance and by using these, you are helping the environment by buying 'recycled'. Feel free to ask any questions!