HS-485HB Deluxe Ball Bearing Karbonite Gear Standard Servo from Hitec - HRC33485S
Hitec’s HS-45HB offers the economy and durability of their other famous micro servos, but now with a ball bearing supported output shaft and Karbonite gears.
Features:

Ideal for .20 - .60 class aircraft and all EP and GP .30-.50 class helicopters
Karbonite gear train that is four times stronger than standard plastic gears
Three pole motor and single ball bearing output shaft

Includes:

1 Hitec HHS-485HB Deluxe ball bearing Karbonite gear standard servo with universal connector
0.94 (24mm) diameter round horn
1.2 (31mm) diameter 4-point horn
1.3 (34mm) double arm horn
1.2 (30.5mm) single arm horn
4 each rubber grommets, eyelets and mounting screws