Hitting Jack-It Baseball Speed Trainer System Bundle (5 oz + 9 oz) Easy to Use; quickly develops bat speed and power Keeps your hands from casting Gives you more confidence as a hitter Forces hands to work properly creating a shorter compact swing Strengthens hands and forearms The Hitting Jack-It is the only Variable Weighted Hitting System on the market today. With its patented design the products will help develop proper swing mechanics for the hitter. All current weighted products on the market today are placed out over the barrel of the bat causing it to become end heavy. Swinging those types of products cause you to cast your bat away from your body developing bad swing mechanics.

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