The Acer XP 905 Comp Driver is the most advanced Acer driver ever! One look at this clubhead and you'll know you're seeing the ultimate in driver technology. Composite Technology means that we've replaced the heavier titanium on the crown with an even lighter carbon graphite material, allowing us to reposition weight where it is needed most. In addition, the maximum allow volume (460cc) and internal perimeter weighting increases the moment of inertia, launches the ball higher and with a spin rate. What this mean to you is simply increased distance and maximum forgiveness off the tee.