Tfi cero features the longest sightline and perpendicular elements encircled by a uniform ring to further stabilize the putterwe all have different putting strokes address positions and club preferences and setting up over the ball perfectly every time is nearly impossible leading to misalignment and off center hits as a result we have developed an alignment technology that allows you to correctly align your putt no matter your setup we call it 2135 there are too many things to worry ab