The Titleist Titanium 975D is a pear-shape, deep face driver. The unique hosel and thru-bore shaft design form a stiff internal tube. This stabilizes the head for maximum energy transfer from club to ball. A reinforced face-crown junction further stiffen the head to provide increased ball speed and a sweet, solid feel. The internal weight and wall thickness are carefully managed to provide increased ball speed and a sweet, solid feel. The internal weight and wall thickness are carefully managed to provide a flatter more penetrating ball flight.