This is the S9256 Digital Servo used with the Futaba GY611 Gyro, FUTM0825.

FEATURES: Aluminum case with heat sink to help cool motor
Special servo for the GY611. Compatible with Super Narrow Pulse of
(760µs) drive.
Nylon gears
One year warranty


INCLUDES: Four rubber grommets to isolate vibration
Four brass eyelets
Four phillips head self-tapping mounting screws
One large servo wheel 35mm in diameter
One star shaped (six arms) servo arm 32mm accross
One X-shaped servo arm 39mm across


REQUIRES: Radio system using Futaba "J" type connectors


SPECS: Dimensions: 1.6 x 0.8 x 1.4" (40 x 20 x 37mm)
Weight: 2.0oz (57g)
Speed: 0.06 sec/60° @ 4.8V
Torque: 47 oz-in (3.4 kg/cm) @ 4.8V


COMMENTS: The following parts are available:
FUTM3443 FGS9251 COMPLETE SERVO GEAR SET S9251 (with metal final
gear)
FUTM3502 FGS9251 1/2/3 GEAR SET (without metal final gear)
FUTM2030 for ht eservo horn