Wilson Spine
The firm uses a recessed titanium crown to push weight
from the center to the club's perimeter, for enhanced
forgiveness on heel and toe strikes. (The head's MOI is 4,900
g/cm2.) Angling the lightweight crown (0.5-millimeter thick)
moves the club's center of gravity lower. This decreases spin
on contact and increases the vertical gear effect. A 46-inch
shaft is standard.

The "spine" improves impact acoustics
and reinforces the crown.
$299, graphite
wilsonstaff.com