This is the Gear Set for the HS-55 servos from HiTec.

FEATURES: White plastic gears, includes all gears for the servo.

INCLUDES: Five white plastic gears

REQUIRES: HS-55 Hitec Servo

COMMENTS: There are no metal servo gears as a replacement. For the servo horns, use HRCM5708 ir/kh updt  

BOX DIMENSIONS: 2.25" W. X .25" H. X 3.00" L. BOX WEIGHT: .01 LBS.