The SKLZ True Line putting mirror is designed with alignment markers to help golfers practice consistent head and eye alignment by properly setting up each time. The built-in slots can create putt gates with tees for most putter heads and the ball cutout allows you to putt directly from the green. The path lines help guide a square takeback and follow through resulting in a more reliable stroke. This mirror features a non-slip base and comes in a compact size for throwing in almost any golf bag.