This is the Savox Waterproof Coreless Digital Servo, .15/277.7.
Features:
Savox’s SW1210SG is the premier waterproof digital servo in their new Lineup. This coreless servo boasts a speed of .15 at 6.0V and 277.7 oz-in of torque. It combines super high 12-bit (4096) resolution, steel gears, and leading edge technology for one versatile and waterproof servo! This is a great upgrade if you're looking to drive your RC vehicle in any condition...ain, sleet, or snow.
Specs:
Dimensions(mm): 40.6x20.7x42.0
Weight(g): 71
Speed(@4.8V sec/60): .18
Torque(@4.8V oz-in): 222.2
Speed(@6.0V sec/60): .15
Torque(@6.0V oz-in): 277.7
Gear: Unique Steel
Bearing: 2BB
Case: Aluminum
25 Tooth Spline