The Hack Attack has a unique three-wheel design that allows you to see the ball clearly and fully all the way through the feeding motion, acceleration and release, just like a live pitcher.With this design, the hitter sees when to stride and the angle of release, giving him an actual live-arm sense of timing and location. With a quick turn of the Hack Attack dials you can effortlessly throw major league fastballs, and right- and left-handed breaking pitches including curveballs, sliders and split fingers.This exclusive three-wheel design changes the breaking pitch plane by simply adjusting wheel speed dials. (All two-wheel units require time consuming awkward throwing head adjustments to change from fastballs to curveballs or right- to left-handed breaking pitches.)The Hack Attack's elevation adjustment handle will raise or lower the pitch. With a simple turn, you can even move the pitch up or down within the strike zone between pitches. (On two-wheel pitching machines it may be necessary to release a locking mechanism, reposition the entire throwing head by tilting it manually and then re-locking the locking mechanism. These are awkward time-consuming adjustments.)