This is the Futaba BLS452 Brushless High Torque EP Car Servo.

FEATURES:
Ideal for electric cars, truck and boats
Metal gears
One year limited warranty

INCLUDES:
Futaba BLS452 Brushless High Torque EP Car Servo with universal connector, 0.83" (21mm) diameter round servo horn, 1.7" (43.6mm)
3-point servo arm, four metal eylets, two rubber grommets and 3x8mm servo horn screw

REQUIRES:
Installing in vehicle, connecting linkage and connecting to receiver

SPECS:
Speed: 0.19 sec/60¢X at 4.8V
0.15 sec/60¢X at 6.0V
Torque: 200 oz-in at 4.8V (14.4 kg/cm)
250 oz-in at 6.0V (18.0 kg/cm)
Size: 1.6 x 0.8 x 1.5" (40 x 20 x 37mm)
Weight: 2.2 oz (63g)
Horn Screw Size: 3x8mm