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 – Mizunos 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 Mizunos CORTECH
  Chamber.
• Straight Flight Bias – Mass spread evenly to encourage a highly stable, straight ball flight.