The Authentic Driving Iron. A long iron replacement with a priority on ball speed – the Mizuno Pro Fli-Hi is designed to be played with a true Hybrid shaft. Relieved of the constraints needed to flow through a complete set, the Mizuno Pro Fli-Hi has a longer head length, a little extra offset and a wider sole than the Mizuno Pro 225 long irons. With Mizuno's first ever Maraging MAS1C face in an iron – for vastly increased ball speeds.