This is the Rage RC S142-16-6VM Standard Size Metal Gear Analog Servo, Torque/Speed6V 142/.16 RGRS142-16-6VM from Rage RC.
Dimensions: 40.8 20.1 38 mm, Weight: 56 g
Operating Speed: 0.18sec/60degree (4.8V), 0.16sec/60degree (6V)
Stall Torque: 9kg.cm/125.2oz.in(4.8V), 10.2kg.cm/141.9oz.in(6V)
Bearing Type: 2BB, Gear Type: Metal