Cage balls are not typically regulation balls, and their increased hardness/compression may damage your high-performance bat. In addition, the use of bat “sleeves” in cages with cage balls may not protect your high-performance bat. Cage balls will void your warranty. For more information concerning purchasing backyard batting cages contact baseballbattingcages.com. We are your batting cage nets for sale, commercial batting cages, commercial batting cages for sale and baseball batting cages for sale company!