RH, Graphite, Regular 3,4,5,6,7,8,9,P,S The Callaway Hawk Eye irons use Tungsten metal to create a more playable iron for the average golfer. The Tungsten Weight Matrix lowers the Center of Gravity to increase initial launch angles which, in turn, increases carry distance. The club is lighter to generate faster club speeds to increase ball speeds so you get the most possible distance from your swing.