Never miss another 3-footer again when you use the Eyeline Golf Impact Ball Liner by Hank Haney. Designed to consistently improve contact on your putting stroke, the Impact Ball Liner will help you drop strokes on the greens this season. Design Use the stencil to mark the "T" on your ball for easy alignment on your putts Allows you to focus your attention on the back of the ball for a square impact and more confident stroke Includes a black Eyeline Golf permanent marker Designed for left and right-handed swings