This is the Savox SV-1270TG Digital High Voltage "Monster Torque" Titanium Gear Servo-savsv1270tg.

Features:
Extremely powerful for its size pushing 486.1 oz-in torque.
Super strong and precision made titanium gears provide high level of durability that will survive heavy use.
Coreless motor brings output performance to the top level – smoother, faster, and more efficient.
Special design for high voltage native 2s LiPo operation.
Water-proof with 4 silicon seals.
Our servos are totally green – from materials to production, these servos are environmentally friendly.
Ideal for large-scale airplane, jet, and 1/5th scale surface

Dimensions(mm): 40.3x20.2x37.2
Weight(g): 56
Speed(@6.0V sec/60): .14
Torque(@6.0V oz-in): 361.1
Speed(@7.4V sec/60): .11
Torque(@7.4V oz-in): 487.7
Gear: Titanium & Aluminum
Bearing: 2BB
Case: Aluminum
25 Tooth Spline