TaylorMade Rossa 05 CGB Daytona 1 putter features Rossa's new Anti-skid Groove System Insert (AGSI) and Center-of-Gravity-Back (CGB) technology. Rossa's new Anti-skid Groove System Insert is characterized by a large putterface insert made of Titallium, an extremely durable seven-metal alloy that is 65% less dense than steel. The face of the insert is scored with 12 CNC-milled grooves. Compared to the standard iron or wedge grooves, AGSI grooves are 66% narrower and 50% closer together. Unlike iron grooves, which are typically empty, each AGSI groove channel is filled with a soft polymer to dampen unwanted vibration at impact, contributing to better feel. How do AGSI grooves affect the ball, given relatively low clubhead speed for even long putts? The answer lies in the composition and structure of the AGSI insert, which is specifically engineered to bring the grooves into direct and active contact with the ball during impact, even on short putts. Titallium has a lower modulus than steel, making the AGSI insert more flexible than a typical steel putter face. Additionally, the grooves in the face serve in part to strategically soften the insert's structure. Together, these factors make the insert deform at impact, putting the AGSI grooves into direct contact with the cover of the ball. On a typical 40-foot putt, the force of impact produces enough deformation of the insert and the golf ball to bring up to five grooves into contact with the ball, while a five-foot putt puts about two grooves in contact with the ball. The behavior of the insert directly contrasts to typical impact dynamics, wherein the clubface remains relatively rigid and the ball deforms. (All clubfaces deform to some degree at impact, with polymer inserts deforming the most. The behavior of the AGSI conforms to the Rules of Golf.) As the putterface lifts and launches the ball forward down the target-line, it imparts forwardspin instead of backspin. How? The unique shape of the grooves "hold" the ball through impact, reducing backspin and promoting forwardspin. Because the ball hits the ground with forwardspin, the degree of bounce and skid is dramatically reduced, as is the potential for the ball to rock off-line to the left or right. The result is better distance accuracy and better directional accuracy, resulting in better putting results. Rossa CGB Technology, introduced last year, employs tungsten CG rods inserted into the rear or tungsten CG plugs inserted into the sole of the putterhead, depending on the model. These rods and plugs serve to concentrate weight in the heel and toe. This helps to shift the putterhead's CG downward and deep into the back, along with increasing MOI. This low, deep-back CG position works in conjunction with the AGSI to deliver the type of optimum, medium-height trajectory that works in conjunction with the forwardspin promoted by the AGSI face insert to reduce bounce and skid.