This product is a 13-tooth Mod 1 pinion gear designed to deliver smooth and reliable power transfer from the motor to the spur gear in your RC vehicle. It is manufactured from hardened steel to withstand high torque, heat, and repeated acceleration without excessive wear. The precision-cut teeth help maintain proper gear mesh and reduce drivetrain noise for consistent performance. It is compatible with select Traxxas brushless motor applications that use Mod 1 gearing. Ideal for gearing changes or replacements, it supports durable and dependable drivetrain operation.