Penn Champ XD HEAD Tennis Balls are used by professionals everywhere, and they are even the ones used in USTA league tennis matches. These HEAD Penn Tennis Balls have controlled fiber release for consistent nap, so you know you're getting reliable performance. Natural rubber gives these HEAD Penn Champ Extra Duty Tennis Balls a consistent feel and reduced shock. Setting the bar high for all other tennis balls, the Penn Champ HEAD Tennis Balls come three to a can, so in this pack of 12 cans you get 36 balls. With so many, you don't need to worry about running out, meaning you can keep your mind on your game.