This is the Spektrum A3030 Sub-Micro Digital Hi-Torque Aircraft Servo.
This servo's lightweight plastic gears, digital precision and incredible 28 oz/in torque rating is ideal for any slow and park flyer aircraft. Its speed is still better than average at 12 sec/60° @ 4.8, so it’s the best of both output worlds. The low deadband technology means that you’ll enjoy reliable accuracy and precision.
The A3030 is the perfect combination of lightweight and holding power performance at a great price. Ball bearing support around the output shank helps keep the servo precise for many flights to come.
Lightweight Plastic Gears
Specifications:Size Category: Minis and MicrosType: DigitalApplication: Slow and park flyer aircraftTorque: 23 oz-in (1.66 kg-cm) @ 4.8V / 28 oz-in (2 kg-cm) @ 6VSpeed: .12 sec/60° @ 4.8 / .10 sec/60° @ 6VLength: .93 in (23.6mm)Width: .45 in (11.5mm)Height: 1 in (25.5mm)Weight: .3 oz (8.6 g)Bushing Or Bearing: BearingBearing: SingleMotor Type: CoredConnector Type: Z-connectorGear Type: NylonGear Material: PlasticVoltage: 4.8 or 6.0V