High-performance Speeder 569 Evolution IV shaft, flex S, made by Fujikura. - Model: Speeder 569 Evolution IV - Flex: S Includes a Callaway sleeve. For drivers. Used with an Epic Speed. This is a shaft you can swing with confidence. I tried various Speeder 569 shafts from 4 to 7, but this was the one I kept until the end because it suited me the best. In my personal experience, it had the strongest rigidity and the most stable ball flight.