This is the HS-6975HB Karbonite Digital High Speed/Torque Servo from Hitec. Part of the new Karbonite digital servo series, the HS-6975HB provides the ultimate in both torque and speed combined. Digital servos offer instantaneous response, precision resolution, and enormous standing torque. This servo features dual ball bearings, Karbonite gears, and programmable digital amp motor. Comes with "S" servo plug installed.

Specifications:
Transit time: 0.13 sec/ 60 deg. @ 4.8V (0.10 sec/deg @ 6V)
Torque: 119 oz/in @ 4.8V (144 oz/in @ 6V)
Weight: 52g (1.83 oz)
Length: 40mm (1.57")
Width: 20mm (0.78")
Height: 37mm (1.45")