Golf Putting Arc MS-3D Putting is an arc, not straight back straight through 1200 professional wins,multiple wins in every professional major, Can use the heal or the toe of your own putter-any putter will work The Putting Arc will enable you to create a pure putting stroke in which the putter head moves on a three dimensional arc back while the face of the putter stays square to the putter path. For rapid and continued improvement use the Putting Arc MS-3D for 5-10 minutes every day.