A great revolution for the big jumping series. Overwhelming performance that everyone can get. Yet, it achieves a sharp "face" that covers the common sense of a jumping series. No more bouncing and good faces. Introducing inpres DRIVESTAR With its sharp face, it has overwhelming flight and straightforward BOOSTBOX converts impact energy to maximum and initial speed. The evolution of the original "BOOSTRING" and "SPEEDBOX". The structure around the face reduces wasted vibration during impact, and converts energy to maximum and initial speed. The science of the striking point of science science scientifies the sense of sensibility and strikes at the most striking point. Golfers tend to hit at the part that recognize the "center of the head height" of the driver. Yamaha focuses on this and has designed the crown shape and face design so that it can be hit at the "most flying point (= center of the face slightly top). COUNTERWEIGHT SYSTEM The key to flight and straight is the lateral moment of the rule limit class. Weighs approximately 25 grams around the center of gravity and are perfectly positioned in three toe, back and heels. This achieves the lateral moment of inertia of 5,570 g/m² of the rule limit class, creating overwhelming flight and straightness. "Good Face" clubs with large moment of inertia tend to generally increase the projection area, but inpres DRIVESTAR has become a classic shape that golfers can handle.