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This extreme perimeter weighting creates very high Moments of Inertia (MOI), which help keep the clubhead stable and resistant to twisting, even on shots hit near the toe or heel.
The super lightweight, 6-4 titanium face insert is strong and 35-percent lighter than a comparable steel face. This extra weight taken out of the face is distributed around the perimeter of the clubhead to create what Callaway calls "the most extreme perimeter weighting of any iron Callaway Golf has ever made."
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