Practice your serve forehand backhand and many more shots with the HEAD Penn Champ XD Tennis Balls 12 Cans (3 Balls per Can). They 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 a consistent nap so you know you re getting reliable performance. The natural rubber gives these sports balls a consistent feel and reduced shock. They come with three to a can so in this pack of 12 cans you get 36 balls.