The putter has a sweet spot - between the toe and heel, top and bottom of the face. The Sweet Spot 360˚ is a reusable foam piece that sticks to the face of your putter. It has an opening in the center for your ball to make sweet contact. Hit the spot and the putt rolls perfect. Miss the spot and there is no sound or roll. Listen for solid contact. How many can you hit in the sweet spot?