Taylor Made Golf- Burner 1.0 4-AW Irons Steel Uniflex Taylor Made Burner 1.0, Conforming Grooves Center of gravity location in each head is precision-placed to optimize long, middle and short-iron flight Inverted Cone Technology promotes faster ball speed on mis-hits for consistent distance Each iron is individually engineered to promote distance and uniform distance gaps Multi-functional sole lowers the center of gravity and reduces turf-drag to make it easy to launch shots high and long