"http://www.amazon.com/gp/product/B009UP5Y0C?tag=httpadvance00-20
A combination of VFT and Hyperbolic Face Technology creates a larger sweet spot and increases ball speeds across the face for longer more consistent distance
Deep clubfaceundercut cavity system enables engineers to precisely position the CG increase face compliance and engineer the face of each individual iron to maximize ball speed
Feel Management Technology Produced through a dual material medallion that fine-tunes sound and promotes a crisp dynamic feel at higher ball speeds
Speed Step 85 Lightweight Steel Shaft Steel shaft is available in both regular and stiff flexes along with lightweight graphite options
Callaway X Hot Iron Combo Set (Men's Right Hand Graphite Regular Flex 4-5H 6-PW AW)"