In this design, Callaway used Titanium with a Tungsten insert to generate a club head that was perfect for use in just about all conditions. The Great Big Bertha Tungsten Titanium Iron hit the procedure in 1997. The Gold Series Iron retained the original’s 360-degree undercut channel and the consistently thin face. The Big Bertha Gold Series has a Rch Series 96 shaft and are man-made from an aluminum bronze alloy for a softer feel. Using the prototype of the primary Big Bertha Iron, designers repositioned the sweet spot, added a new contoured sole and redistributed the weight in the head.
Callaway also introduced the Big Bertha Gold Series Iron in 1996.
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