Callaway Big Bertha Alpha 815 Double Black Diamond Driver The Callaway Big Bertha Alpha 815 Double Black Diamond Driver is a driver for the elite players, the ones who need the most spin reduction to hammer drives that leave their playing partners speechless. If you can handle a Tour-inspired shape, RMOTO Distance Technology, and extreme low spin, this is the driver youve been dreaming of hitting. RMOTO: A cool name and even better distance technology. It saves weight to move the center of gravity (CG) lower for elite players, increases forgiveness, and gives you higher ball speeds across the face. Multi-Material Construction: All the best, most important driver technology has gone into this club. It has the lowest CG, most forgiveness, an outrageously hot face, and over 20 grams of discretionary weight. Youll put it to good use. Tour-Inspired Shape: This driver features a deep face and smaller footprint that Tour pros love. OptiFit Technology: Its Callaway adjustability at its finest, with an adjustable hosel that lets you choose from a combination of eight different loft (-1, S, +1, +2) and lie angle (Draw or Neutral) configurations. Now this is how you find your optimized trajectory and shot shape. Also, the adjustable heel and toe weights (1g and 5g) really let you control your shot shape.