Callaway Great Big Bertha Fairway Wood. The Callaway Great Big Bertha was one of the best-selling drivers of all time - and was Callaway's first titanium driver. This was the fairway wood to match. Titanium (60% stronger than stainless steel but 40% lighter) allows players of every skill level greater confidence. The S2H2 (Short Straight, Hollow Hosel - whereby the shaft is bored right though the head and then filed off) concept in the Great Big Bertha Titanium Warbird allows Callaway to transfer weight from the neck, where it has no benefit, to the head, where the weight is needed the most. Exactly the same principle is used in all of Callaway's current model woods.