This is the Futaba S3004 Light Weight, Ball-Bearing Servo.  This standard servo is used in cars, boats, or where any standard servo is called for.  These include mounting hardware and extra servo horns.  These produce 44 oz/in of torque at 4.8V, and a whopping 57 oz/in at 6V, making these an excellent value.

Note: This servo is not designed for use with glow-powered helicopters.

FEATURES:
Single ball bearing on output shaft.
Precise tight fit throughout the geartrain.
Being standard size and light weight, it fits many applications.
Three pole motor

INCLUDES:
One S3004 standard servo with preinstalled round servo horn
Four brass eyelets
Four black one-piece rectangle rubber grommets
Four servo mounting screws
Three servo horns (1 lg. round, 1 lg."X" and 1 sm. "x")

SPECS:
Speed:  0.23 sec/60 degrees at 4.8V
               0.19 sec/60 degrees at 6.0V
Torque:  44 oz-in (3.2kg-cm) at 4.8V
               57 oz-in (4.1kg-cm) at 6.0V
Length: 1.6" (41mm)
Width:  0.8" (20mm)
Height: 1.4" (36mm)
Weight: 1.3 ounce (37.2 grams)