Mizuno spent four years developing, testing, and creating multiple iterations that improved stability, spin, and sound to produce a tour-level driver. 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 evenly spread mass, the ST-Z 230 is incredibly stable and produces a straight ball flight. Mizuno ST-Z 230 Limited Edition Driver Features: Limited edition colorway and shaft Modern player's profile pushed lower to the ground for low/mid spin performance and aligns square to open 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 Shaft: Project X HZRDUS Blue RDX PVD 60 Stock Grip: MCC Teams Blue/White Authorized Mizuno Retailer Buy Limited Edition Mizuno Drivers