Yonex Z-Force Graphite Mens Irons Yonex really clean sheeted this on the drawing board resulting in this high launch, long distance and forgiving iron set which is ideal for players looking for distance gains without loss of accuracy. The Yonex Z-FORCE's forgiving irons feature a super deep undercut cavity with an enlarged head giving you a higher launch for greater distance and control. SUS431 Stainless Steel Precision Casting FIND THE FORCE Looking for a more powerful, yet forgiving club? New Octaforce technology reduces weight in the crown of the Driver, Fairways and Hybrid. Repositioning it where it really makes a difference, lower and deeper in the club head for the optimum distance enhancing ball flight with maximum forgiveness. The Irons’ Super Deep Undercut Cavity technology produces a lower centre of gravity and larger sweet spot for increased distance and added forgiveness. Looking for the Force. Find the Z-FORCE. The new M60 hi-stability, graphite shaft has a slightly more flexible butt section to allow you to load the shaft properly for a more stable swing path whilst the stronger tip will give you the added stability for maximum distance.