The stainless steel, wire-frame head construction allows weight to be moved from the middle of the head to the perimeter, increasing MOI for greater forgiveness on mis-hits. TaylorMade Movable Weight Technology( allows players to change Corza's feel by installing differently weighted TLC cartridges in two rear TLC ports. Rossa Corza's linear alignment system makes it easier to aim the putterface, increasing confidence and accuracy.AGSI (Anti-skid Groove System Insert)Twelve uniquely shaped CNC-milled grooves help to promote forwardspin and reduce skid and bounce, equaling superior distance-control and accuracy. Each groove is filled with a soft polymer filling that absorbs unwanted impact vibration and contributes to Corza's extraordinarily satisfying feel at impact. The weight saved by Rossa's light-yet-strong Titallium insert is redistributed in the perimeter of the putterhead, increasing MOI for exceptional forgiveness on mis-hits.