This is the Hitec/RCD HS-425BB Pro servo with a Universal Futaba J, Hitec S, JR and Airtronics Z connector.
Includes: One HS-425BBS Servo and One Servo Accessory Bag (grommets, screws, bushings, horns)
Note: This servo shares the same case with the HS-300 servos. The biggest difference is that this servo has dual ball bearings, making it faster, with more torque, and less slop.
Length: 41mm (1.6")
Width: 20mm (0.8")
Height: 36.5mm (1.4")
Weight: 45.5 (1.60oz)
Torque: 45.9 oz-in
Transit Time: 0.20sec