Wilson Staff Di9 Men's Iron Set (5-PW, AW, SW) A lower profile and wider sole lowers the CG promoting a higher and straighter ball flight for greater distance. Because 85 % of all shots are hit from the center to the toe Di9 has the highest MOI when compared to key competitors. Covering the entire length of the cavity is a low durometer The aggressive design on the fully functional grips have blister free zones under the thumbs