This is the Hitec HS-65HB Mighty Micro Feather Servo with the Universal Connector.  Because this has the universal connector, it will work with JR, Hitec, Futaba, and Airtronics Z radio systems.  This is great for micro helicopters, park flyers, and 1/18 scale cars.

Features:

• HS-65HB has long lasting and durable Karbonite gears
• One of the slimmest micro servos available
• Hitec's most powerful servo in the micro class
• The HS-65HB was created for higher performance micro helicopters, electric Park Flyers, & 1/18 scale cars, and features a top ball-bearing for long life and positive centering

Includes:
(1) HS-65HB Micro Servo
(4) M1.7x7 servo mounting screws
(1) Two-sided servo horn
(1) One-sided servo horn
(1) M1.7x3 servo horn screw
(1) Four-sided servo horn

Specifications:
Length:    0.92" (23.6mm)
Width:    0.45" (11.6mm)
Height:    0.94" (24mm)
Weigth:    0.38oz (11.2g)
Speed:    0.14/60° @ 4.8V
Output Torque:    24.99 oz-in  @ 4.8V