Pure2Improve Practice Cup. Sinking breaking putts is all about visualizing the right line. The Practice cup's unique horseshoe shape forces players to hit to the high side of the hole, and can be used as an extra practice cup. Helps players improve the accuracy of their line and speed on putts of all lengths. Fits in a standard golf hole, and has a 2.75 inch opening that forces the player to make putts in the high side. Small hole opening makes real holes appear larger once the player is out on the course. Perfect target for practicing at home or office. Can use it as a practice hole (on the turf) on a crowded practice green.