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The square head increases the club head's Moment of Inertia (MOI) or resistance to twisting during off-center hits
A wider, taller sweet spot for consistently longer drives
Moving the center of gravity farther back makes the clubface easier to square for straighter drives
You will find the new I Drive Square very hard not to hit long and straight. USGA has a new limit on MOI for this exact reason.(moment of inertia relates to stability on off-center-hits. A key to maximizing moment of inertia is to push weight as far away from the center of gravity as possible.)
Compare to 2007 Callaway FT - i?
Material: 90Ti-^Al-4V Beta Titanium
Finish: Grey
Diameter: .335 Parallel Tip Picture: Expanded View
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