Tee gates for putters, stroke path and the ball are awesome for training. Creating gates indoors prohibits using tees, so we created the new EyeLine Indoor Putting Posts. They are designed to slide into place, and fit snugly with you slightly rotate them. They stay in place when you move your aid to make your training better and efficient. The Posts work with the EyeLine Classic Mirror, Putting Alignment Mirror, Total Stroke, and the Slot Trainer.