Bownet 9" Snap Back Poly-Flex Training Balls Twelve pack of baseball sized poly-flex balls engineered to outlast thousands of hits from the lightest hitters to ball destroyers without denting or cracking Snap BackTM design collapses and snaps back to create greater impact feedback and a longer period of kinetic transfer from bat to ball Limited flight following a hit providing less time retrieving balls from across a field and more time for play Heavier duty distributed weight makes throwing in the wind easy and builds accuracy when thrown into the Big Mouth Net (sold separately) 9" size balls help train batting accuracy and provides a target for honing players' focus