These tennis balls are an economical alternative for teaching or practice. Penn Coach Practice tennis balls are the same quality tennis balls you’d expect from Penn, just with slight cosmetic blemishes. While these cosmetic blemishes don’t affect the playability of the ball, they are enough to prevent them from passing Penn’s stringent quality control. Each can contains 3 tennis balls. Case of 24 cans, 72 balls per case. Color: Yellow.