The primary objective of the Zingbat is to teach the batter to stay inside the ball, which in turn will make one have a quicker swing with better mechanics. This is a sequential training bat, which should help the batter to learn the correct techniques to developing a good swing. Staying inside the ball will make the batter quicker, which in turn will allow one a longer time to see the pitch before swinging, and then to swing with more power. Remember that repetition is primary to learning; therefore, we feel that the minimum usage of the Zingbat would be a 10-10-10 series of swings. Any increase in the repetition cycles will be to the advantage of the batter. Training Manual and Instruction Video Included!! Dry Swing Bat Sizes Model # Length Weight ZB27Y 27" 23oz ZB27 27" 27oz ZB30 30" 30oz ZB33 33" 33oz Bat Size Recommendations Beginners 27 oz. Intermediate 30 oz. Advanced 33 oz. To order CHOOSE from the Dropdown menu.