This is the S9350 Digital Servo w/Two Ball Bearings for Car and Boat Use and Comes with "J" Connector Pre-Installed.

What is Special ? Metal case acts as a Heat Sink to reduce Heat and is designed to be Water and Dust Proof.

The list of powerful functions :

FEATURES:
Comes with Heavy Duty wiring that can handle Higher Current Loads.
New Metal casing which helps to dissipate heat.
Coreless Motor
Dual Ball Bearing Output Shaft
Metal Gears
High Torque
Dust and Water Proof
Great for 1/8 Cars or Boats Where Higher Torque and Speed are Needed.
One year warranty.

INCLUDES:
One Digital High Torque Servo w/Small Round Horn
Four Rectangular Grommets
Four Brass Bushings
Four Mounting Screws
One Large Round Horn
One Six Arm Horn
One Four Arm Horn

SPECS:
Speed: .15 sec/60 degrees @ 4.8V - .12 Sec/60 Degrees @ 6.0V
Torque: 111 oz/in @ 4.8V - 139 oz/in @ 6V
(8.0 kg/cm @ 4.8V - 10.0 kg/cm @6V)
Weight: 2.1 oz (63g)
Length: 1.6" (41mm)
Width: 0.8" (20mm)
Height: 1.5" (38mm)