Callaway® Big Bertha 2008 steel irons (3-PW). The seamless performance progression throughout the set provides consistent distance separation, while the modified Tru-Bore® polycarbonate tip plug at the end of the shaft enhances feel and performance. The low, deep center of gravity helps get the ball in the air quickly. I-Brids™: clubs that blend the control and accuracy of irons with the forgiveness, distance and versatility of hybrids. The low, deep center of gravity helps get the ball in the air quickly and easily, and the extremely wide sole improves turf interaction Seamless performance progression throughout the set provides consistent distance separation with optimal trajectories Extreme Notch Weighting redistributes more weight to the perimeter for a higher MOI VFT® Technology maximizes ball speed and perimeter weighting