What Titleist Say:
ALWAYS GRINDING. Introducing SM9. Anyone can manufacture a wedge, but it takes a master to turn a piece of high-performance technology into an instrument of creative control. Bob’s six tour-proven grinds are designed to offer maximum creativity, versatility and consistency, all meticulously developed through years of working with the best players in the world.

Benefits:

• Tour-Proven Grinds - For every shot, every lie, every course, there’s a grind fit for your swing. Finding the right grind to match your swing and playing conditions will
  give you the best turf interaction, contact and shot performance. Master Craftsman Bob Vokey has spent decades crafting, developing and improving his tour proven grinds
  to fit players of all levels.
• Progressive Center Of Gravity - SM9 s a progressive center of gravity (CG) throughout the lofts, which optimizes ball flight, accuracy and forgiveness. Using
  tapered top lines and varied hosel lengths, the Vokey R&D team has raised the height of the CG in the higher lofts, which promotes a lower, more controlled flight. The
  CG is also forward of the face, resulting in increased MOI, exceptional feel and a club face that simply wants to square up at impact.
• Spin Milled Grooves - SM9’s patented Spin Milled grooves are meticulously engineered through a new cutting process to maximize spin and durability. The process starts by
  cutting the face perfectly flat with a high-speed saw. Then every groove is individually cut based on loft and finish; low lofts (46°-54°) are designed with narrower,
  deeper grooves, while higher lofts (56°-62°) have wider, shallower grooves. Micro-grooves are individually cut in between grooves, which maximize spin on partial shots.
  A proprietary heat treatment is applied to the impact area which doubles the durability of the groove without impacting feel, making it the most durable groove in golf.
  The process is only complete when every Vokey wedge is 100% inspected for utmost quality and performance.
• K Grind - The highest bounce wedge in the lineup and the ultimate bunker club. A wide, full sole wedge with enhanced camber, the K Grind is forgiving from a variety of
  softer sand and turf conditions.