PENN | Coach Teaching Tennis Balls | 524304CS Ideal for practice or teaching, Penn Coach Teaching Tennis Balls are an economical alternative to regulation tennis balls. While these tennis balls may have minor defects or cosmetic blemishes that prevented them from passing quality control, Penn Coach Teaching Tennis Balls offer the durability and bounce needed for effective practice. 24 Cans per box with 3 balls in each can Total of 72 individual tennis balls per box Balls are in pressurized cans to maintain the right bounce.