This is the Savox SH-0265MG Digital Metal Gear Micro Servo.
Dimensions: 22.8 x 12 x 27.5 mm
Weight: 15 g
Bearings: 2 BB
Operating Voltage: 4.8-6.0V
Torque @4.8V: 1.8 kg/cm (25 oz/in)
Torque @6.0V: 2.4 kg/cm (33.3 oz/in)
Speed @4.8V: 0.09 sec/60°
Speed @6.0V: 0.075 sec/60°
Also worth noting, of all the Savox micro servos, this is the the best balance of speed and torque. Others are faster but with less torque. There is one other unit that has much more torque, but is much slower.
This servo is only a few dollars more than the stock unit that comes with LaTrax cars/trucks and will outlast every other part.