This is the Gear Set for the Hitec HS-5585MH Servo, HRCM5585.

FEATURES: Steel aluminum and nylon construction Replaces worn gears and restores proper servo operation

INCLUDES: 1st, 2nd, 3rd and Output Gear  

BOX DIMENSIONS: 3.00" W. X .75" H. X 3.50" L. BOX WEIGHT: .03 LBS.