The new powerful  EyelineGroove+ Putting Laser is easy to use, providing instant visual feedback. Simply shine the laser crosshairs and align them with the face of the putter, bisecting the putter head. Make your stroke. If your hands rotate the putter face, the laser target line will point to the right or left. Keep your hands quiet and the line through the ball will track perfectly on the target line - back and through. Amazing The strong tactical grade housing is built for durability and long life. Eyeline used a high-grade glass lens and a Polycarbonate shaft connector for strength. It\'s time to Groove your stroke