S3016 Ball Bearing Metal Gear Mini Servo from Futaba - FUTM0032
The S3016 mini has dual ball bearings on the output shaft, is lightweight and fits many aircraft where mini servos are required. The S3016 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
Dual ball bearings on output shaft
Precise tight fit throughout the geartrain
Being standard size and lightweight, it fits many applications
Metal gears

Includes:

1x S3016 ball bearing metal gear mini servo

1x 0.83" (21mm) diameter round Horn
1x 1.4" (35mm) diameter round Horn
1x 1.2" (32mm) six-point Horn
1x 1.5" (39mm) four point Horn
4x each eyelets, grommets and 1.5 x 11mm mounting screws
One year warranty