Set includes: #3 thru #9 irons, Pitching Wedge: 46°Available separately: #2 Iron • Approach Wedge: 51° • Sand Wedge: 56° • Lob Wedge: 60°Steel shaft available in Uniflex which is ideal for most golfersGraphite RCH 75i shaft available in Senior, Regular or Firm flexGraphite RCH 85i shaft available in Strong flexThree components -- a proprietary Tunite(TM) alloy cradle, a lightweight titanium face insert, and a TPU SenSert(TM) -- make the Big Bertha Fusion Irons the most technologically advanced irons available today.At the heart of Fusion Technology in the new Big Bertha Fusion Irons design is the Tunite alloy cradle.Callaway Golf designers created a new, patented alloy for the cradle that is ultra-dense and allows 77% of the clubhead mass to be repositioned to the perimeter of the head.