TIGER'S FINGERPRINT Each iron has been meticulously shaped to meet Tiger's discerning eye-longer blade length, thinner topline, progressive face height, and more GRIND SOLE DEBUT IN IRONS Milled Grind eliminates variances in sole geometry from head to head and ensures precision in every iron set, while the CNC machined sole geometry and a precise leading edge promote consistent turf interaction.. TUNGSTEN WEIGHTING Precise tungsten weight placement engineered to improve trajectory control and promote a deeper feel at impact..