Oversize heads made stainless steel. The main feature of this set of irons is the Powersole design which is a wide sole that is the same thickness throughout the set. This wide sole ensures a lower centre of gravity making it easy to get the ball up in the air- especially with the long irons. The irons also have a deep undercut cavity which moves the centre of gravity lower back in the sole ensuring the ball leaves the club at the correct launch angle Offset design through the set makes it easier to square up the irons- making this set ideal for players who fade/slice the ball.