You’ll notice the difference. The golf ball comes off the face faster. It feels like a more solid impact without creating a hard feel. 
Callaway have given us “Jailbreak Technology” as the next big step in Driver design.
            The continued evolution of the Great Big Bertha (GBB) works for all golfers. Whoever you are, and whatever your motivation for playing, 
finding your ball further down the fairway after a walk on the short grass, makes the round more enjoyable.
            When a conventional metalwood makes impact with the ball some energy is lost as the crown flexes upwards, and the sole flexes downwards. 
The Callaway GBB Epic head, on the right, has two Titanium bars connecting crown to sole. 
That minimizes energy loss. In fact it creates “energy lensing” to maximize energy transfer and ball speed. 
Dr Hocknell of Callaway Golf explains very
 well how this technology works for you.
            
            This is a revolution in design that is a result of the long-term Callaway evolution in materials and their use to bring consistency 
and performance to our games. 
            If the Crown is just 9.7 grams and the 
Sole is only 5.8 grams then how much 
can be designed into the bits in between 
to provide ball speed and forgiveness. 
            
            
            
            
            We can change your shot shape by up 
to 21 yards from side to side by using 
the redesigned track and sliding weight 
in the rear of the sole.
            
            So the Callaway GBB Epic Driver is equipment we’re keen to put in your hands
            
            Lets see just how big a difference ‘Jailbreak Technology’ makes to your tee shot performance.