This unique training device helps you to visualise your target line & improve the speed of your putts. This putting cup has a horseshoe shape with a 2.75" opening that forces you to hit putts on the high side. It also fits a standard size golf hole or can be used on a crowded practise green. The smaller 2.75" opening provides increased confidence once you hit the course, making real holes appear larger. It is also great for practising at home or office.