What Mizuno Says:
A straight bias driver with great stability on off centre hits. Similar in look and character to the previous ST-Z. Boosted by the CORTECH Chamber to be faster from the face, spin less and deliver an incredible, solid sensation at impact.

Details & Benefits:

• Cortech Chamber - Mizuno’s CORTECH Chamber encases a dense stainless steel weight with elastomeric TPU – taking stress from the clubface and creating
  an additional energy source. At the same time locating weight closer to the clubface to reduce spin rates. While contributing to a more solid,
  powerful sensation at impact.
• Unified Sole Composite - Carbon sole plate now a single piece to allow weight to be pushed to the extremes for overall stability.
• Forged SAT 2041 BETA TI Face - More resilient than commonly used 6-4 Ti, with more complex multi-thickness design – made possible by Mizuno’s CORTECH
  Chamber.
• Straight Flight Bias - Mass spread evenly to encourage a highly stable, straight ball flight.