This is the Hitec HS-5087MG Metal Gear Digital Micro Servo.

FEATURES: High voltage version of the Hitec HS-5085MG servo
          Ideal steering servo for 1/16 scale vehicles, .15 - .40-size glow and
            electric aircraft and 500 size helicopters
          3-pole ferrite motor
          Lightweight metal gears with top ball bearing
          Programmable digital circuit
          Two year limited warranty through Hitec beginning at date of purchase

INCLUDES: Hitec HS-5087MG Servo
          1.1" (29mm) Double Arm Servo
          0.67" (17mm) Round Horn
          0.90" (23mm) Four Point Horn
          Mounting Hardware

SPECS:                   6.0V                   7.4V
          Speed:      0.17 sec at 60°        0.13 sec at 60°
          Torque:     50oz-in (3.6kg-cm)     60oz-in (4.3kg-cm)
          Size: 1.14 x 0.51 x 1.18" (29 x 13 x 30mm)
          Weight: 0.77oz (21.9g)

                                                                   jxs 12/27/11
                                                                         ir/jxs