The 21oz “Big League” On-Deck Weight is made to be optimally positioned on your bat so you can warm up using correct swing mechanics.

Baseball players at the highest competitive levels – players like Evan Longoria, Tampa Bay Rays third baseman, and Dustin Pedroia, Boston Red Sox second baseman – are now relying on the Hitting Jack-It System, the leading variable weighted hitting system, for building Strength & Power and improving their hitting skills.

The Hitting Jack-It System is a cone-shaped, rubber-coated carbon steel weight with an open side that slips onto the handle of the bat and fits snugly at the bottom of the bat barrel above the batter’s hands.

The Hitting Jack-It System was developed as a complete hitting system “by ball players for ball players” to provide immediate results, quickly build bat speed and power, and force the batter’s hands to work properly, thus creating improved technique.

The first and only weighted system on the market that can be used to hit “live” (with a pitcher) batting practice, the Hitting Jack-It^TM System comes in four sizes to assist progressive training.