Mizuno ST-X 230 Driver (Right-Handed)Mizuno ST X 230 Driver The Mizuno ST X 230 Driver features a more rounded, deeper profile with weight located closer to the hosel means slightly higher spinning and draw biased for the majority, but more workable for many elite players (especially in lower lofts). Natural drawers of the ball may find more ball speed from the ST X. Boosted by the CORTECH Chamber to be faster from the face, spin less and deliver an incredible, solid sensation at impact.