HobbyKing 939MG Metal Gear Servo 2.5kg/ 0.14sec / 12.5g
A strong performer with a very smooth movement and good centering.
Excellent for parkflyers or planes up to .40 size (3,500mAh electric).

Specs:
Model: HK939MG
Size: 22.5X11.5X24.6mm(0.88"x0.45"x0.96")
Weight: 12.5g
Operating Voltage: 4.8V / 6.0V
Operating Current: 200mA / 240mA
Operateing speed : 0.14sec.60° / 0.13sec.60° 
Stall torque : 2.5kg.cm / 2.7kg.cm
Dead band : ≤5uSec
Operateing speed: 40º/one side pulse traveling 400us
Potentiometer: 2 slider/Direct Drive
Ball bearing: MR85
Gear: Metal
Type: Analog
Motor: Coreless
Connector wire length: 215mm
Operating Temperature Range: -20 °C to +60°C
Spline count: 21