The XXIO9 series Irons feature the newest improvement to Dual Speed Technology, a boost in efficiency for the initial portion of the downswing. Lag is increased by utilizing a heavier hear and a lighter shaft with a higher balance point moving the CG closer to the grip. This improvement to the club brings the club head in tighter to the body of the golfer for a more efficient swing, which generates more centrifugal force (rotational speed) for increased head speed and greater distance.
5-piece head structure (#4-7) for an even lower center of gravity In addition to the nickel weight in the sole, engineers have placed high-density tungsten weights in the toe and heel. The result is a head with the lowest CG in XXIO history and a high heel-to-toe MOI. This 5-piece structure enables the ball to get airborne with ease and further improves the carry distance on miss-hits.