This is the Ace RC C0915 Micro BB servo.

FEATURES: Ideal for small electric planes and heli's
          One ball bearing
          Universal connector
          Plastic gears
          4P gear type
          18 month warranty

INCLUDES: One C0915 micro servo, 2 eyelets, 2 rubber grommets, 2
          mounting screws, one 4 arm 0.80" diamter horn, one 2 arm
          1.10" diameter horn, and one circular .70" horn

SPECS:    Dimensions: 0.87 x .45 x 0.93" (22.1 x 11.4 x 23.6mm)
          Weight: 0.32oz (9 g)
          Speed: 0.095 sec/60° @ 4.8V
          Torque: 20.8 oz-in @ 4.8V (1.5kg/cm)
          Power Supply 4.8V only

                                                                     JAW 2/1/11