This is the Hitec HS-45HB Premium Feather Micro Servo with connector that fits Futaba, Hitec, JR and Airtronics Z radios.
Includes: One Servo with X horn and mounting screws and additional X horns and also a long servo horn
Size: 23.6x9.8x22.4mm (0.92x0.38 x0.88)
Output Torque: 1.0Kg-cm (13.88oz-in) at 4.8Volt
Operating Speed: 0.14 sec/ 60°at 4.8Volt
Weight: 8g (0.28oz)