Use Jugs® Sting-Free® Dimpled 11" Softballs with any pitching machine for maximum accuracy and performance in during batting practice. The B2020 Dimpled Training Balls are the same size and weight as regulation leather softballs and feel like leather balls when hit, but they will not dent aluminum bats or stings the hitter’s hands. Includes a dozen Sting-Free® Dimpled Softballs per purchase. FEATURES: Size : 11" Sport : Fastpitch or Slow Pitch Cover : Bright yellow dimpled synthetic material for maximum accuracy and performance Core : Lightweight, sponge-like design feels like a regular size leather softball yet enhances safety League/Certification(s) : Practice only Additions : Will not dent aluminum bats or sting hitters' hands League/Certification(s) : Practice only Balls included in purchase : 12 (dozen) Recommended use : Most pitching Machines Manufacturer's warranty: : 1 year Model : B2020 Jugs For additional information relating to the Manufacturer's Warranty, please contact 1-800-547-6843.