The patented 3-In-1 Swing Groover Golf Swing Trainer accurately indicates direction of shot - just like hitting a real ball but with no shagging. Striking the ball causes it to orbit on its unbreakable nylon cord. A hook or slice will be clearly shown by off center orbits. Promotes a grooved smooth swing and follow through. Develops muscle memory. Adjustable ball height lets you practice with woods or irons. All new design for easy assembly. Practice indoors or out. Base constructed of high quality laminate to resist warping and provide stability. The ball height is easily adjusted using the fingertip screws. Remove the swing arm and convert the trainer into a deluxe hitting mat. One rubber tee included for use with a driver.