This is the Futaba Servo Gear Set for the S9151 Digital Servo (FUTM0211). These gears fit on shafts inside the servo and multiply and deliver torque to the output shaft. FEATURES: Restores servo operation to like-new condition. Nylon construction for long life. INCLUDES: One Futaba Servo Gear Set for the S9151 Digital Servo (FUTM0211) with 1st, 2nd, and 3rd gears and splined output shaft. REQUIRES: Disassembly of servo and removal of old gears. JXS 6/4/01 ir/jl