Stiff Flex ST Woods have been carefully developed to bring topnotch stability sound and spin to your bag The ST230 woods now add exceptional ball speeds through the CORTECH Chamber It encases a stainless steel weight with an elastomeric TPU that creates extreme energy while moving weight closer to the clubface to reduce spin The result is a big shift in stability and ball speeds on offcenter strikes STZ 230 features a balanced toe/heel carbon composite construction with a deep central back weight for efficient spin and a straight ball flight A forged SAT2041 Beta Ti face is brought back for potent ball speeds and consistent performance GlobalGolfcom online store offers superior selection service and quality for your Mizuno golf Clubs needs