This is the Ace RC DS1510 Metal Gear High Torque Digital Servo.

FEATURES: Designed for high torque applications such as 1/8 scale off-road
            steering, and .50 helicopters
          Digitally enhanced microprocessors for fast transmitter input to
            servo reaction time
          Three pole motor with dual ball bearing supported output shaft
          Four metal gears

INCLUDES: Servo with two 1.7" (44mm) Double Arm Horns, four each Mounting
            Screws, Grommets and Eyelets

SPECS:    Torque: 8.5kg/cm @ 4.8V, 10kg/cm @ 6.0V
          Speed: 0.19 sec/60° @ 4.8V, 0.15 sec/60° @ 6.0V
          Dimensions: 1.6 x 0.79 x 1.5" (40.4 x 20 x 37.9mm)
          Weight: 1.75oz (49.7g)

                                                                   jxs 05/10/13
                                                                         ir/jxs