DRIVER TSURUYA ONESIDER JI DIAMANA #10.5Simply shortening the shaft makes it stiffer and harder to flex. Making the head heavy for an appropriate balance results in the club being too heavy to swing. Therefore, we jointly developed with Mitsubishi Chemical a specially designed shaft that is short but the balance is not too light and the head not too heavy. The lowered and softened vibration frequency achieves a head run with a low kick point, increasing the flying distance and providing a