S3004 Ball Bearing Nylon Gear Servo from Futaba - FUTM0004
The S3004 has a single ball bearing on the output shaft, is lightweight and fits many aircraft where mini servos are required. The S3004 is a basic servo that works well for medium size airplanes and 600 size helicopters.
Features:

Quality, basic servo perfect for 600 size helicopters and medium sized aircraft
Single ball bearing on output shaft
Precise tight fit throughout the geartrain
Being standard size and lightweight, it fits many applications
Three pole motor

Includes:

1x S3004 ball bearing standard servo pre-installed round servo horn

4x brass eyelets
4x black one-piece rectangular rubber grommets
4x servo mounting screws
3x servo horns (1 lg. round, 1 lg."X" and 1 sm. "x")
One year warranty