The Arthur Xtreme Engineering Xcaliber graphite .370 iron shafts
The rapidly tapering geometry in the center can result in as much as a 1000-2000 rpm (spin) increase over steel shafts
Taper Tipped Graphite Shafts Designed to Give Stronger Players a True Alternative to Steel Shafts.
Tour Weight and Feel with Trajectory Control Desired by Better Players
Aerotech Steelfiber 80 CW Graphite Taper Tip Iron Set
Arthur Xtreme Engineering XCaliber Tour SL Graphite Iron Shafts .