For the first time in the world, high repulsion-generating maraging steel is forged in a cup form to achieve higher repulsion force. Because of this cup structure, 3 dimensional flow-weight design is able to be used to change the toe-heel weight distribution and the depth of the center of gravity according to each iron's number. Through this, regardless of which club you use you can easily make your shot, well balanced and always using the same timing (This capability is also integrated into our "Majesty Prestigio").