![]() The crown weighs just 10.8g, the sole panels 7.4g. The clubhead consists of an aerospace-grade titanium Exo-cage outfitted with a crown and sole pan-els made of triaxial carbon, an extraordinarily light and strong composite material developed by Calla-way. Physicists call this “energy lensing.” In Epic, it promotes faster ball speed for more distance. That puts more of the load of impact on the face. Jailbreak bars form a firm connection between the crown and sole to inhibit their flexing. At impact, a metalwood’s face flexes and the crown bulges upward while the sole bulges downward. Callaway calls the new Great Big Bertha Epic Sub Zero Driver “a true paradigm shift in tour driver per-formance.” Its power is based on Callaway’s innovative new Jailbreak Technology, which fundamentally changes how the head and clubface behave at impact to deliver more ball speed and distance.
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