This is an Arrma Kraton/Outcast 8S BLX Spur Gear.
 
Features:
Strong steel for long-lasting durability in all conditions 
Precision manufactured tooth configuration for smooth power transfer and consistent performance 
Engineered to provide consistent operation when large-scale brushless motors are supplying the power to your vehicle's drive line
Specification:
Module Gear Pitch: 1.0
 
Includes:
(1) Spur Gear