This is the Hitec HS-635HB High-Torque Karbonite Gear Standard Servo with the Universal Connector.  The universal connector means this servo will work with all current JR, Futaba, Hitec, and Airtronics Z receivers and wiring.  This general purpose servo may be used in sport and high performance aircraft up to 12 pounds.

The HS-635HB utilizes the revolutionary “Karbonite” gear train.  Karbonite is four times stronger than our standard nylon gears and even after hundreds of thousands of cycles it does not show any signs of wear.  With a powerful motor, and dual ball-bearing mounted output shaft, the HS-635HB offers plenty of torque and speed. If your application requires increased speed and torque, the HS-635HB is the perfect upgrade from a standard size servo. 

Features:

• Replaces the 605BB and offers improved centering and resolution
• Gears are constructed of Karbonite which is up to four times stronger than standard nylon gears
• Dual ball bearings
• Three-pole ferrite motor

Includes:
One Hitec HS-635HB High-Torque Standard Servo with universal connector, one 1.7" diameter 4 point servo horn, one 1.8" diameter round servo horn, one 2.3" long 2 point servo horn, one 1.3" 1 point servo horn, 4 rubber grommets, 4 eyelets, four 2mm x 15mm phillips head mounting screws

Specifications:
Torque: 69.43 / 83.32 oz.in (4.8v/6v)
Speed:  0.18 / 0.15 sec @ 60 deg.
Weight  1.83oz (52.1g)
Length: 1.6"
Width:  0.8"
Height: 1.5"