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-resistant 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