Wilson Staff Di9 Irons, Set of 8 (LH, Graphite, 5-PW, GW, AW Uniflex) 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 and lower fore finger The Di9 incorporates a toe friendly cavity that extends the sweet spot to where most shots are hit The vertical and horizontal grooves promote torsional traction for rotation Vibration-dampening urethane medallion which expands the sweet spot to the entire length of the face