This is the Futaba S3114 Micro High Torque Servo.

FEATURES: Ideal for electric planes and small electric helis

INCLUDES: Futaba S3114 Micro High Torque Servo
One .91" x .64" (23mmx16mm) 4 arm servo horn (comes pre-installed)
One 1.33" x 1.33" (34mmx34mm) 4 arm servo horn

REQUIRES: Installing in aircraft and connecting to receiver

SPECS:               6V                          4.8V
Torque: 23.5 oz-in  (1.7 kg-cm)     20.8 oz-in (1.5 kg-cm)
Speed:  0.09 sec/60?               .10 sec/60?
Dimensions: .86 x .43 x .78" (21.8 x 11 x 19.8mm)
Weight: .27oz (7.8g)
Lead Length: 6.5" (165mm)