Stiff Flex. Cobras new KING Tour MIM irons are the first to be manufactured using the metal injection molding method to bring precise shaping and exceptional feel in a players iron. Tungsten weighting in the toe centers the CG directly behind the sweet spot, maximizing distance and precision, even on off center strikes. The TPU insert is placed behind the hitting zone to dampen vibrations for a softer, yet solid feel at impact.