This is the Spektrum S6390BL 1/8 Digital High Torque Servo. High-Voltage applications up to 8.4V and feature all metal case construction for the ultimate 1/8th scale performance.
Features:
Specifications: Size Category: Standard Type: Digital Application: 1/8 Off-Road Brushless High Speed/Torque Servo Torque: 312 oz-in (22.5kg-cm) @ 8.4V Speed: 0.09 sec/60 deg @ 8.4V, at no load Length: 1.58 in (40.1mm) Width: 0.79 in (20.1mm) Height: 1.47 in (37.3mm) Weight: 2.3 oz (65g) Motor Type: Brushless Connector Type: Z-Connector Gear Material: Stainless Steel