This is the Hitec HS-7235MH Coreless Motor High Voltage Digital Mini Servo.

FEATURES: Ideal for mid-size gas and electric airplanes, 500-550 electric helis
            1/12 scale on-road racers, and 1/18 scale rock crawlers
          Coreless motor optimized for 7.4V operation
          Heavy-duty metal gear train with dual ball bearings
          Water and dust resistant
          G2 high resolution digital amplifier with MOSFET drive
          Two year limited warranty through Hitec beginning at date of purchase

INCLUDES: Hitec HS-7235MH Servo
          1.3" (34mm) Double Arm Horn
          1.2" (30mm) Single Arm Horn
          0.94" (24mm) Round Horn
          1.2" (31mm) Four Point Horn
          0.87" (22mm) Aluminum Single Arm Horn
          Mounting Hardware

SPECS:                    6.0V                      7.4V
          Speed:      0.09 sec at 60°           0.08 sec at 60°
          Torque:     49.9oz-in (3.6kg-cm)      61.1oz-in (4.4kg-cm)
          Weight: 1.2oz (34g)
          Size: 1.28 x 0.66 x 1.29" (32.4 x 16.8 x 32.8mm)

COMMENTS: A note on coreless motors-a conventional servo motor has a steel core
            armature wrapped with wire that spins inside the magnets. In a
            Coreless design, the armature uses a wire mesh that forms a cup
            that spins around the outside of the magnet. This arrangement is
            much lighter resulting in smoother operation and faster response
            time.

                                                                   jxs 12/27/11
                                                                         ir/jxs