Take your training to the next level with the Jugs(R) Perfect Strike(TM) PS-50 Baseballs. The Perfect Strike(TM) dimpled yellow balls are specifically designed for use with pitching machines, and will not dent aluminum bats. The B1001 balls are constructed to mimic the same size and weight as leather baseballs and to feel like leather upon contact with the bat provides a realistic experience. FEATURES: Cover : Yellow dimpled synthetic material for maximum accuracy and performance Core : Feels like a leather ball when hit Technologies : Will not dent aluminum bats or sting hitters' hands Additions : Same size and weight as regular leather baseballs League/Certification(s) : Practice only Balls included in purchase : 6 Recommended use : Most pitching Machines Manufacturer's warranty: : 1 year Model : B1001 Jugs Click here for additional information relating to the Manufacturer's Warranty.