The Wilson Staff Fi5 Performance Iron rewards the play of advanced shot makers by moving Centre of Gravity location from lower in the long irons to higher in the short irons. This is accomplished by concentrating weighting in the sole of the long irons, perimeter cavity back weighting in the mid irons, and pure muscleback weighting in the short irons. The Fi5 series is designed in the time-honored tradition of forged clubs, with thin top-lines and sole widths. 8620 mild carbon steel is used for maximum feedback at impact. Tour proven and meticulously weight sorted True Temper Dynamic Gold shafts in a .355 taper tip help maximize control and accuracy. Standard grips are Golf Pride Tour Velvet Cord.