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This fastpitch softball Hitting Jack-It training system features a series of three weights that fit over your bat; start with the lightest and work your way up! They're designed to increase bat speed and help you develop strength and power during live batting practice. The system also promotes proper swing mechanics and discourages casting. Features Helps you develop strength and power when practicing off tees For use during live batting practice Provides instant results Increases ball exit velocity Promotes proper swing mechanics Discourages casting Can be used with any fastpitch softball bat System includes 5 oz, 9 oz, and 12 oz weights Total Set Weight: 26 oz 1-year manufacturer's warranty

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