The cobra max irons are designed for the higher handicap golfer an easy to hit set equipped with techflo techflo utilizes half hallow technology in the longer irons increasing forgiveness cavity back designs in the 8 9 and pw irons and a speciality wedge design to help you improve your scorespeed channel facean engineered trench behind the face area helps to minimize face thickness and increase flex at impact to deliver increased distance through faster ball speeds even on mis hitshollow