Thank you for viewing. When you say PRGR's masterpiece, the No. 1 would be this TR-X370Duo. It's now a popular design, using carbon for the crown to allow the entire head to flex at impact, converting it into power to increase distance! Back then, it was common for the face to flex like a trampoline and generate repulsion, but the appearance of this Duo, which used the entire head to achieve distance, influenced many drivers afterward. It was also used in professional tournaments, and the Ozaki brothers, Jumbo and Takeo, also loved and used it. It was once a phantom driver that was difficult to obtain even in used shops. Now that it's available at an affordable price, please give it a try!! Please understand that this is a used item. Instant purchase is OK. #golf #golfclub #golfclubset #PRGR #JumboOzaki