Hitting the "sweet spot" of the putter is paramount to great putting * Developed with Top Teacher Todd Sones, to help you learn wheather you"re hitting the top, bottom, toe or heel on your missed putts * Works for all three learning styles - visually line up your putter face to the ball, you will hear a "thud" if you miss the sweet spot, feel the spongy contact of the foam versus the solid feel of the center of your putter. * Every time you make a correct stroke, you will be rewarded by hitting the center of your putter, putting a solid roll on the ball.