Unique advanced technology for higher kick velocity BOOSTBOX: the combination of BOOSTRING technology that consolidates the area near the face into a fixed ring-shaped structure and SPEEDBOX structure that increases the rigidity around the face perimeter. That inhibits excessive vibration during impact, which transfers impact energy into kick velocity to a maximal degree.

Golfers subconsciously tend to try and hit the ball at the point they think is the vertical center of the club.Therefore, considering that tendency, Yamaha designed the crown and face shape so that the area that is subconsciously recognized as the center matches the location that results in the longest flight, which is slightly above the face center. The head was designed so that impact points are centered in the upper portion of the club face. Now, a normal swing produces a higher club head revolution velocity at the face center, which increases kick velocity.

The rules-limit-class transverse moment of inertia 5,570g・cm² was achieved with unique COUNTERWEIGHT SYSTEM that optimally places a total of approximately 25g of weight on the toe, back, and heel around the center of gravity. Even if the ball is not hit at the ideal contact point, straight-line stability and the kick velocity of the ball are maintained to produce an impressive fight distance and trajectory consistency.

Clubs having a large moment of inertia tend to have a large projection area, however, inpres DRIVESTAR features traditional shorter length and sharper shape in rearward direction, making it easier to establish a comfortable stance.