The PENN Court One Tennis Balls are sold through CSI as a single Can. These are durable Extra Duty optic yellow tennis balls perfect for any tennis court surface. The Court One's feature a soft core designed by PENN to increase ball control. They use high quality felt to get the proper nap on each tennis ball they sell. PENN also implements crack resistant seams so that your tennis balls last longer and have longer game play. These PENN Court One tennis balls are recommended for recreational play. These tennis balls are US Tennis Association Approved and will satisfy the most serious tennis players. This product is priced and sold by the can, which contains 3 tennis balls.