The Tiger Shark Optix Putters have a unique alignment system that features a white bar that helps the golfer position the putter against the golf ball for a visible alignment. The putter also has the ability to be professionally marked with three orange lines for a more precise alignment. Simply mark your golf balls with the marking tool (included), and align the three lines for a perfect alignment. Three different models are available: The original Optix mallet, the Optix Tour and the Optix Blade. In designing the Optix, Tiger Shark teamed up with Fine Tune Golf, the makers of the Line M Up ball alignment system. After marking your ball with the USGA conforming Line M Up tool, the Optix sights can be aligned with the ball markings to help you zero in on the perfect spot on the golf ball.