Wilson Staff Model D9 Golf Irons – Graphite The Wilson Staff Model D9 Golf Irons are built to offer high launch, lower spin, and incredible stopping power for pinpoint accuracy. Wilson has used a revolutionary approach to Iron design, with the aim of improving your game. LOW CG This is Wilson’s lowest-ever CG in an iron. This has increased launch angles, delivering a steeper angle of descent for improved green-side control. URETHANE-FILLED POWER HOLES These have been strategically positioned to enable maximum face flex, improving ball speed and expanding the sweet spot, adding forgiveness to this Club.