Product description the bullseye cup acts as a 30 cup reducer it is a circular device with a 2 inch opening that visually shows where a breaking putt will enter the hole see the perfect line to begin make a few strokes and find the proper line for a breaking putt you are practicing take notice of which side of the cup the ball enters the hole next place your bullseye inside the hole with the opening turned to where the ball will enter the hole now you can visually see the gate where the