Introducing the new jpx ez irons theses irons are design for the golfer looking for maximum forgiveness with feel mizuno has used a multi thickness face and cavity that has been reinforced for stability a new black ni finish with a dual cavity pocket for extreme ball speed off miss hit shots the jpx ez irons also come with their harmonic impact technology which is a frame engineered into the cavity to improve the feel of the club and make it feel like a mizuno iron should even with its cast