This is the Spektrum H6010 Digital Heli Servo.
The H6010 combines an impressive 100 oz-in of torque with a rugged brass-nylon gear train. This performance, along with the smooth precision of its dual ball-bearing output shaft, makes it the ultimate sport servo for everything from .30- to .50-size nitro helis to 600-size electric helis.
Size Category: Standard
Application: .30- to .50-size nitros, 600-size electric helis
Torque: 100 oz-in (7.2 kg-cm) @ 6.0V
Speed: 0.14 sec/60° @ 6.0V
Length: 1.61 in (41mm)
Width: 0.79 in (20mm)
Height: 1.54 in (39mm)
Weight: 1.7 oz (49 g)
Bushing Or Bearing: Bearing
Motor Type: Brushed
Gear Material: Brass/Nylon
Voltage: 4.8V or 6.0V (4- or 5-cell NiMH)