All-new design double-shaft high torque motor designed for use with Mini 4WD professional series racers. Engine reduces power loss and provides higher level running additionally on slopes and curves. Either end of this double-shaft features push on healthy steel pinion gears for efficient power transmission. This engine can be utilized in formal Tamiya Mini 4WD races. *Compatible framework: Mini 4WD PRO show framework (never appropriate for Dangun or non- PRO show racers)