This is the Hitec HS-65HB Mighty Feather Micro Servo with Universal Futaba J, Hitec S, JR and Airtronics Z Connector.
$24.99
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