Cobra Amp Cell Men's 6-Piece Golf Iron Set Metal wood face-weld construction with E9 Face Technology: Creates a high COR zone and controls weighting with a lighter, high-strength face for explosive distance and forgiveness AMP Cell technology: Distributes weight from the face and body to create perimeter weighting and positions CG behind the Sweet Zone V-skid sole design: Sculpted sole configuration that improves turf interaction for all swing types 6 Piece set configuration