The Cobra AMP Irons have E9 face technology that helps to create a more forgiving face and allow for longer straighter shots. Made with a full cavity back that helps to place the Center of Gravity lower and further back on the face. This gives a higher initial launch while helping to create a more stable face through the hitting zone. The Cobra AMP Irons are a great game improvement iron, and was awarded a gold medal from Golf Digest for best irons of the year.