This is the HS-422 Deluxe Servo Pro from Hitec. The HS-422 is one of the most durable and reliable servos Hitec has ever offered. With its dual iron-oilite bearings, high impact resin gear train and high performance circuitry, the HS-422 features excellent centering and resolution.

Specifications:
Transit time: 0.21 sec/ 60 deg. @ 4.8V (0.16 sec/deg @ 6V)
Torque: 3.3 kg/cm @ 4.8V (4.1 kg/cm @ 6V)
Torque: 46 oz/in @ 4.8V (57 oz/in @ 6V)
Weight: 45.5g (1.6 oz)
Length: 40mm (1.57")
Width: 20mm (0.78")
Height: 37mm (1.45")