The ST539 iron is a forged CNC Milled (face and back). The general design of the clubhead with it’s low COG makes it EZ to hit that extends to higher handicappers as well as very good players. This iron set offers from 11* Zero iron up to 65* Zero wedge. No other set in the industry offers such a wide range in both RH and LH irons. A thin top line with wide sole low COG makes for the easiest forged iron on the market concerning playability, feel and performance.