Mizuno ST-Z 230 Golf Driver The highly anticipated release of the Mizuno ST-Z 230 driver is now upon us and this stunning driver looks like it will certainly live up to expectations. The Mizuno ST-Z 230 straight bias driver offers great stability on off centre hits and although similar in looks and character to the previous ST-Z it is now boosted by the CORTECH Chamber to be faster from the face, spin less and deliver an incredible, solid sensation at impact. Mizuno’s CORTECH Chamber encases a 3 gram stainless steel weight with elastomeric TPU – taking stress from the clubface and creating an additional source of energy. The Design focus is a combination of deeper CG and shorter CG distance for a balance of workability in both...