Nike SQ Machspeed 8-Piece Men's Iron Set (4-AW, 2011 Model) Speed = Distance: The combination of AM355 stainless alloy and an off-the-face weld construction creates a thinner, hotter face and wider sweet zone Stability = Forgiveness: The Nike PowerBow creates extreme deep CG. This provides a wider sweet spot and higher trajectory Launch: The deep undercut repositions 50 grams of weight low and back to the Nike PowerBow for high launching shots that travel far and land softly Lightweight, 90 gram steel shafts, features ultimate control while allowing increased swing speed Radical new construction method combined with a hot, thin alloy face creates the fastest Nike iron ever