Designed to give you instant feedback on all areas of putting alignment, the Putting Plane System allows you to putt exactly as you would on the course. The mirrored surface allows you to check that your eyes are over the ball, shoulders are lined up, and putter face is square. The inside rail, adjustable to fit any putter and slanted at 72 degrees, allows the putter to come slightly inside as it moves back and up during the stroke. Our Putting Systems are lightweight yet tough, and fit conveniently in your bag.