Mizuno ST-Z 230 Driver — 10.5° Stiff Flex Right Hand

The ST-Z 230 is Mizuno’s straight-flight specialist, built around a forged SAT2041 Beta-Titanium face that resists the micro-fractures common in standard 6-4 titanium, holding its pop shot after shot. A single-piece Cortech Chamber carbon sole plate lets Mizuno push weight to the extremes of the head for serious stability, while a deep central sole weight and balanced carbon composite placement bias the ball flight straight and keep spin low rather than favoring a hard draw or fade. The Quick Switch hosel gives 4 degrees of loft adjustability to dial in trajectory, and Mizuno’s engineers spent a year tuning the impact tone to a denser, more muted, powerful sound that their tour pros preferred over a tinnier ping.

This build comes in 10.5° loft, Stiff flex, Right Hand, with a Mitsubishi Kai’Li Blue 60 shaft and standard synthetic rubber grip.

Buyer feedback is strongly positive: a 12-handicap golfer in his 60s reported jumping from a 230-yard average drive to 244, with occasional 270-290 yard drives after dialing in the adjustable hosel. Other buyers praised the forgiving sweet spot, straighter ball flight on mishits, and the value relative to other major-brand drivers. One reviewer found the adjustment settings a bit confusing at first but was won over by the performance once dialed in. Sold and shipped by Amazon.com.