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:

• Brushless motor
• High-speed
• High-torque
• Steel gears
• Aluminum finned case for good heat dissipation
• Aluminum mounting tabs
• Dual main bearings
• 23T output shaft
• 1-Year Limited Manufacturer Warranty

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