17g Metal Gear Reverse Servo with 1110mm (44") Lead from Freewing - MD31172R-1110
This servo is used on various Freewing airplanes.  It can be used with other aircraft with compatible specifications (see below).
Features:

Lightweight, efficient high torque metal gear servo perfect for various EDF jets in the 70\/80\/90mm class

Includes:

Freewing 17g Metal Gear Servo with 1110mm (44") Lead
4 mounting screws
2 servo horns