The Crescent Putting Trainer provides immediate feedback on miss-hit putts.  “Used to practice on the putting green, the Crescent is a simple device that adheres to the putter face.”  The Crescent provides instant feedback with every stroke.  Regardless of putting style, the Crescent trains you to hit the ball square and in the sweet spot. With a proper stroke, the ball comes off the putter face rolling straight and true.  Hit the ball towards the toe or heel, and the miss-hit feedback is immediate.  The ball will follow a path above or below your intended line.