The Eyeline 50/50 training balls are an instant diagnostic tool for your putting stroke.  Make a good stroke and the centre 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. The MyRoll Ball has a great putting feel.Features of the Eyeline MyRoll 50/50 Training Ball- 2 colour ball - White/Black- Get instant feedback on your putting and chips- Make a good stroke and the centre 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 centre line to wobble- Turn the ball 90˚ so you are...