This is a High Torque, High Speed Digital Mini Servo from Futaba.

FEATURES: Coreless motor: conventional servo motors have a steel core armature
wrapped with wire that spins inside magnets. In a coreless design
the armature uses a wire mesh that forms a cup that spins around
the outside of a magnet. This arrangement is much lighter, which
results in smoother operation and faster response time.
Nylon Gears
Can be used with 1/12 or 1/18 scale vehicles and electric helicopters
One year warranty

INCLUDES: One servo w/ 4 rubber grommets and brass eyelets, and one .83" (21mm)
diameter round horn
Instruction/Precaution sheet
Warranty Card

SPECS: Length: 43mm between centers of side mounting holes
35.5mm servo body length
42.5mm between the centers of standard mounting holes
Width: 15mm
Height: 28.6mm
Weight: .9oz (26g)

SPEED: .14 sec/60° @ 4.8V
.11 sec/60° @ 6V
TORQUE: 3.6 kg-cm @ 4.8V (50 oz-in @ 4.8V)
4.5 kg-cm @ 6V (62.5 oz-in @ 6.0V)