This is the Futaba Standard Size High Torque Servo.
This servo can produce high-current draw from your batteries if using NiMH or LiPo batteries, make sure they are capable of delivering approximately 2A for each servo.

FEATURES:
Ideal for high-torque applications requiring a standard size servo
Universal connector fits Futaba, Hitec, JR, KO Propo, Airtronics Z, and Tower Hobbies. Does not fit old Airtronics A plug w/out adapter
Nylon gears
One bearing pre-mounted on output shaft.
One year warranty

INCLUDES:
One Futaba standard size high torque servo with . . .
One 1.4" (35mm) diameter round servo wheel
One 1.5" (39mm) diameter 4 point servo wheel
One 1.25" (32mm) diameter 6 point servo wheel
Four 2mm x 11mm phillips screws
Four rubber grommets & Four metal eyelets

REQUIRES:
Small phillips screwdriver to mount to surface

SPECS:
Speed: 0.20 sec/60¢X @ 4.8V
0.16 sec/60¢X @ 6.0V
Torque: 72 oz-in (5.2 kg-cm) @ 4.8V and
90 oz-in (6.5 kg-cm) @ 6V
Dimensions: 1.6 x 0.8 x 1.5" (40 x 20 x 38mm)
Weight: 1.5oz (41g)