They have also used a special chemically milled hyperbolic acid reduction process on the face cup to increase the effective hitting area (sweet spot) on the Callaway Diablo Edge Driver. This process enables Callaway to accurately distribute the weight across the clubface by varying the thickness in the required places. This larger sweet spot means more distance off of the tee on those off center drives, as ball speed will not be affected or reduced as much.
Callaway Diablo Edge Driver on http://golfsetstore.com
This club is definitely a shade longer than the original. I believe there are several factors responsible for this. While the original sported the same hot "X-Face" technology that Callaway has been refining for several years, this newer model, similar to the new FT iZ Model, also features said an X-Face technology that has been "Chemically Milled." As I explained in the FT iZ review, this process is similar to the old "Acid Dipping" process we used to use to remove dead weight from the heavy gauge steel bodies of our old hot rods when we were kids. Similarly to the old GTO's and Plymouth Belvedere's of our generation, this newer "Chemically Milled Face" has had the dynamic spots made larger, and the deader spots made much smaller. Though all drivers max out at .830 COR by USGA Regulations, the entire face does feel more consistent. Hit one of these anywhere near the sweet spot--and that ball is going to fly.
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