The Callaway Rogue ST Max OS irons are game-improvement irons. They have a large sweet spot, and shots that are off-center don't have much horizontal spin imparted on the ball so slices aren't as "slicey" and hooks aren't as "hooky." The center of gravity is much lower compared to players irons so the ball gets a up in the air quickly and carries a long way. A great club for golfers that are new to the game and need all the help they can get to get the ball up and going straight towards the flag. It's primarily due to the "Tungsten Weighting" technology that Callaway incorporates. The design includes precisely placed tungsten weights within the clubhead to optimize the center of gravity (CG). The Tungsten Weighting helps to lower and center the CG, which promotes higher launch angles and enhances forgiveness on off-center hits. This technology allows for better weight distribution, increasing the moment of inertia (MOI) and resulting in more stable and consistent ball flight. The strategic use of tungsten also helps to improve overall distance control and provides a more balanced and forgiving performance from anywhere on the course.