With more professional tour wins than any other graphite iron shaft in history, SteelFiber iron shafts are the preferred option by the world's best. SteelFiber shafts come in many weights and are the only graphite iron shafts to feature Aerotech's unique SteelFiber technology – combining the power of graphite with the stability of steel. The new SteelFiber i55 is the lightest weight version in the SteelFiber shaft line up. The SteelFiber i55 .370" parallel tip iron shafts are designed for players with slower swing speeds needing enhanced trajectory and distance.