Product Overview: While the SteelFiber technology was originally designed for golf iron shafts, Aerotech has also made these shafts’ unique performance benefits available in golf wood shafts. Features: The wood shafts are limited to 65 grams and up due to the full layer of steel on the shaft’s surface. Therefore, this technology is a perfect fit for fairway woods or by players who can benefit from a moderate weighted driver shaft. wood shafts are the right choice for players who are looking for the control of a steel shaft in their driver and fairway woods but who also want to benefit from the lighter weights and vibration dampening properties of graphite shaft.