The SUPERIOR Green-Reading System SlopeVision Precision Aiming System is designed to match or exceed the accuracy of methods used at the highest level of golf today. And it is delivered in an easy-to-use form that most any golfer can master. Why It Works: See the Slope, Don’t Just Feel It: Using your putter to gauge the slope is SO much more accurate and easier to learn than trying to feel the slope. Proven Aim Method: SlopeVision Ball Marker aim lines match the aim points of the current leading method used on professional tours and the leading putting simulator. Proven More Accurate: A better slope estimate combined with an easier way to aim makes your green reading MUCH more accurate. Conforms to the Rules: SlopeVision explicitly follows the Equipment Rules and Playing Rules and can be used in competition.