LASER MILLED FACE. Using the precision accuracy of a laser, 4 perfectly calibrated texture lines are milled between each groove exactly to the conforming roughness limit. This breakthrough surface roughness application optimizes ball-to-face friction and maximizes spin under the rules of golf. ZIP GROOVES. An envelope-stretching groove geometry that optimizes groove dimensions to conforming limits. The larger groove volume channels the most debris possible at impact to improve contact from the rough and maximize spin.