This is the Gear Set for the HS-50 servos from HiTec. FEATURES: White plastic gears, includes all gears for the servo INCLUDES: Four white plastic gears REQUIRES: HS-50 Hitec Servo- HRCM0985 COMMENTS: There are no metal servo gears as a replacement For the servo horns, use HRCM5708 JAW 2/6/07 ir/jxs