This is the Spektrum RC SX108 Micro Metal Gear Servo.
The SX108 is purpose built for steering micro and mini models and is a great servo for utility functions like 2 – Speed transmissions and Dig. With its durable design combined with dual bearing output support, metal-gear durability, smooth coreless motor operation, an impressive 41.8 oz-in torque rating, the SX108 is the perfect mighty micro servo for your small scale vehicles.
Features:
20T Spline, Full metal gear drive train
Includes additional 4 inch extension
41.8oz-in torque rating @6v
0.08 sec/60° speed @6v
Cable Length: 55mm from case to end of plug
Specifications:
Product Height: 0.87" (22 mm)
Servo Type: Digital
Product Length: 0.89" (23 mm)
Servo Size Category: Mini and Micro
Product Weight: 0.35oz (10g)
Maximum Servo Torque: 34.9oz/in @ 4.8V, 41.8ozin @ 6V
Product Width: 0.49" (12 mm)