Wilson Staff C-100 4-PW, GW Iron Set with Steel Shafts An optimal size head design with a sleek mirror black PVD finish and contrasting face Exoskeleton weighting accounts for one-third of the total head mass, maximizing the MOI and forgiveness while still maintaining a midsize head shape A stronger, stainless steel material allows for the thinnest-faced Wilson Staff Control (C) iron yet, creating faster ball speeds and longer distances