Great Big Bertha Hawkeye
E
ach Great Big Bertha Hawk Eye Titanium Driver and Fairway Wood is finished with a precision-matched Tungsten Gravity Screw that is inserted into the sole of the clubhead. Less than 2% of the total volume of the 3-wood clubhead, yet 25% of the total weight, this Tungsten Gravity Screw is positioned in the precise location to achieve the ideal center of gravity -extremely low and deep.
The company:
http://www.callawaygolf.com