The Eyeline Golf Shoulder Mirror joins to the Eyeline Golf putting alignment mirror (Sold separately) and ensures the shoulders are kept square for solid, end over end putts. Just slide the shoulder mirror against the bottom edge of the putting mirror (Sold separately) and enjoy perfect shoulder alignment in seconds. Square shoulders equal perfect alignment for fewer putts. The stroke follows the shoulders, so alignment is critical. Don\'t neglect one of the most important factors of putting! Add the shoulder mirror to your Eyeline Golf putting alignment mirror. Highly recommended and available to purchase now at Golfsupport.