In addition to the two-piece structure of titanium cup face and stainless steel body, it adopts a variable hardening face with a thick center and gradually changing the peripheral thickness. It has a high tolerance against variations in the RBI. It has a head shape that can be used comfortably according to the flow of FW and iron, and it has a good sitting feeling, a good grip and a sense of stability of the ball muscle. It features "wide and deep M-shaped groove (M force pocket)" on the front of the sole. This structure, which flexes not only the cup face but also the body, greatly expands the high initial velocity area of the entire face. It produces a high initial velocity of the ball even under the face where it is easy to miss a hit. The "Sound Rib" placed inside the sole suppresses excessive bending of the body and reduces backspin. It has a role to tune the impact sound, and has a comfortable playing feel and a romano sound. UT is highly evaluated by Japanese golf players.