The new Derby Plus irons are manufactured from high-grade, heat-treated investment cast 17-4 stainless steel for incredible feel and control. The optimum offset of the Derby which progresses from the short irons through the long irons, squares the face at impact for additional accuracy and optimum trajectory. The new 'wave-weighted control' cavity system increases the clubs' perimeter weighting, promoting consistently easy and accurate shot making through the set. A redesigned leading edge reduces turf drag to provide more consistent ball contact.