Louisville Slugger L30325 Instructo Swing Batting Trainer Instructo Swing teaches proper mechanics of the swing. Teaches proper eye position when swinging the bat-eliminates learning bad habits. Multi-adjustable to teach level swing, upward swing and downward swing, both linear and rotational. Teaches players to hit inside, middle, and outside pitches. Can incorporate home plate to learn the different hitting areas and hitting to different fields. Teach players to hit low (hardest pitch to hit), middle, and high pitches The Instructo Swing is for all ages; children to adults. Used by major league teams, and players in the minors, college, and high schools Great training aide to teach players to become switch hitters and teaches players to hit to all fields. Developed by Erik Laeske, hitting and fielding instructor to the Toronto Blue Jays, and past association with the Boston Red Sox (Ted Williams & Wade Boggs on the "science of hitting")