Mizuno spent four years developing, testing, and creating multiple iterations that improved stability, spin, and sound to produce a tour-level driver. �Now, the new Mizuno ST 230 Drivers add explosive distance to the performance equation through CORTECH Chamber technology.�� Strategically located close to the face, the CORTECH Chamber encases a stainless steel weight with elastomeric TPU, resulting in decreased spin and an additional energy source that increases ball speed. �At the same time, CORTECH reduces stress on the face, granting Mizuno's engineers the ability to construct the face out of a more resilient material. �Utilizing Forged SAT 2041 Beta Titanium instead of the more commonly used 6-4 Titanium allows for a thinner, faster face, with a complex multi-thickness design that preserves ball speed on mis-hits. With its rounded, deeper profile, and weight located closer to the heel, the ST-X 230 generates slightly higher spin rates and a slice-fighting draw bias. �According to Mizuno, natural drawers of the ball may find more ball speed from the ST-X. Mizuno ST-X 230 Driver Features: More rounded, deeper look that sits a little taller and aligns square in the neutral setting Weight located closer to the shaft axis encourages a draw-biased ball flight CORETCH Chamber encases a dense stainless steel weight with elastomeric TPU to take stress off the face and create an additional energy source for added ball speed; also locates weight closer to the face to reduce spin while producing a more solid, powerful sensation at impact Forged SAT 2041 Beta Ti Face is more resilient and has a complex multi-thickness design for fast ball speeds across the face Unified carbon sole plate is now a single piece that allows weight to be pushed to the extreme perimeter for overall stability Quick Switch Hosel allows for +/- 2� of loft adjustments Stock Shafts: Mitsubishi Kai'li Blue � UST LIN-Q M40X TSPX Red � UST Helium Nanocore Black Stock Grip: Lamkin Hybrid 360 Hea