This is the HS-5665MH High Speed, High Volt Metal Gear Servo from Hitec.
Designed to be powered from a 2-cell 7.4V LiPo battery for extra speed and power. Ideal for 1/10 to 1/8 scale on- and off-road vehicles, larger sport helis and large scale aerobatic aircraft up to 25%. Programmable features include; Dead Band Width, Rotation Direction, Rotation Speed, End Points/Neutral Points, Fail Safe On/Off, Fail Safe Point, (requires Hitec programmer HFP20 HRCM4430, HPP20 or HPP21 HRCM4420) Heavy duty metal gear train (MK first gear) Three pole ferrite 7.4V optimized motor. Dual ball bearing output shaft.
Motor Type : Three pole ferrite (7.4V wind)
Bearing Type : Dual ball bearing
Speed : 6.0V, 0.16 sec/60° 7.4V, 0.14 sec/60°
Torque : 6.0V, 122 oz-in (8.8 kg-cm) 7.4V, 139 oz-in (10 kg-cm)
Size : 1.6 x 0.8 x 1.5" (41 x 20 x 38mm)
Weight : 2.1oz (60g)