Fujikura SPEEDER BOOST DRIVER SHAFTFujikura Speeder Boost The Speeder Boost is a "Double Kick" shaft that combines the VTC (Variable Torque Core) technology found in the Speeder NX series with a distinct flexibility profile. By intentionally reducing the bending stiffness in both the handle and tip sections, the shaft is designed to maximize movement, making it easy for the golfer to clearly feel the shaft load and unload throughout the swing. Typically, shafts with this much flex can