An instant diagnostic tool for your putting stroke. Make a good stroke and the center line will roll straight and true. Use the red Impact Ball Line to bring your focus to hitting the back of the ball squarely. An open or closed putter face will cause the center line to wobble.
Ideal for filming your stroke. Turn the ball 90˚ so you are making contact with only one color of the ball. In slow motion you can instantly see the skid, spin, and roll of the ball.