What you need to know: The product of Mizuno’s Speed Technology (ST) Metalwood Project — four years of rapid-fire metalwoods development — 2023 Mizuno ST-Z 230, ST-X 230, and ST-PLTNM feature the centerpiece Cortech Chamber, within which a steel weight is positioned for increased ball speed and spin reduction. The technology extends to the ST-Z 230 fairway wood and hybrid as well.

Mizuno ST-Z 230, ST-X 230: What’s new, key technology

Cortech Chamber: Through slot provides additional COR area by providing sole flex filled with elastomeric TPU material for additional flexure and face stress reduction. Inside the TPU is a stainless steel weight, which is positioned close to the clubface for increased speed and spin reduction. Also contributes to a solid feeling at impact.

SAT 2041 Forged Beta Titanium Face: More flexible and stronger than 6-4 titanium.

Additional model details

ST-Z 230

• Billed as a “straight, stable, and low spinning” driver. Designed for stability on off-center hits.
• Engineers focused on positioning CG location being as close as possible to the Z-axis or neutral axis for lower spin, straight performance, and higher MOI.
• Forged SAT 2041 Beta Ti face, aided by the Cortech Chamber, enhances ball speed and reduces spin
• 14-gram back weight
• Shallower CG for a more penetrating ball flight

ST-X 230

• Billed as a “more workable, mild draw-biased” driver
• Higher spinning, higher launching than ST-Z 230
• Deeper CG and shorter CG distance for a balance of workability in both directions
• 14-gram heel weight
• Toe side composite for shorter CG to shaft axis distance
• More rounded, deeper profile

ST-X PLTNM 230

• An ultra lightweight driver for slower swing speeds
• High launching
• Draw biased
• The ST-X PLTNM is 30g lighter overall than any possible custom option of the ST-X 230
• High spec Helium Platinum Shaft and lightweight grip

What Mizuno says

“Our player testing over the years shows that placing extra weight close to the face results in faster ball speeds and low spin rates,” says David Llewellyn, Director of R&D for Mizuno. “We’ve been steadily working towards the CORTECH Chamber, which is incredibly effective at that job. Encasing the steel weight within the TPU Chamber means that we’re moving weight close to the face at the same time as creating an additional source of energy. Steel is twice the density of Titanium but won’t weld directly, which is where the TPU has a second role.”

More photos

ST-Z 230

ST-X 230

ST-Z 230 Fairway Wood

• A mid-low spinning, high launching, adjustable fairway wood
• Mid-sized and playable for all levels
• High energy MAS1C steel face boosted by Mizuno’s Cortech Chamber
• The carbon composite crown for a low center of gravity
• Quick Switch hosel offers 4 degrees of adjustability

ST-Z 230 Hybrid

• A mid-low spinning, high launching, adjustable hybrid
• High energy MAS1C steel face boosted by Mizuno’s Cortech Chamber
• Waffle crown, thick sole weight create a deep center of gravity for high launch
• With respect to the CLK, the ST-Z 230 is slightly larger

Price, specs, availability

Drivers

ST-Z

Availability: Right Hand – 9.5 and 10.5 degrees
Left hand – 9.5 degrees only

ST-X

Availability: Right Hand – 9.5, 10.5, and 12 degrees
Left hand – 9.5 degrees only

Fairway wood

Right Hand – 3 wood (15) and 5 wood (18)
Left hand – 3 wood (15)

Hybrid

Availability: Right Hand – 2H (16), 3H (19), 4H (22) and 5H (25)
Left Hand – 3H (19) and 4H (22)

Pricing

ST-Z 230 Driver / ST-X 230 Driver: $499.95
ST-Z 230 PLTNM Driver: $549.95
ST-Z 230 Fairway Woods: $299.95

At retail: February