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 STX 230 is a drawbiased driver with a carbon composite construction and a heel side sole weight GlobalGolfcom online store offers superior selection service and quality for your Mizuno golf Clubs needs