This is the Savox SV-1272SG Digital "Monster Torque" Metal Gear High Voltage Servo.
Features:
Extremely powerful for its size pushing 416 oz-in torque @ 7.4V.
Super strong and precision made unique steel gears provide durability that will survive heavy use.
Coreless motor delivers smooth, fast, and efficient performance.
Special design for high voltage 2S LiPo operation.
Servos are totally green – from materials to production, these servos are environmentally friendly.
Ideal for large-scale airplane, jet, and 1/5th scale surface
Specifications:
Dimensions: 40.3x20.2x37.2mm
Weight: 63g
Speed:
@6.0V: .13 sec/60
@7.4V: .10 sec/60
Torque:
@6.0V: 319.4 oz-in
@7.4V: 416.6 oz-in
Gear: Unique Steel
Bearing: 2BB
Case: Aluminum
Spline: 25 Tooth