Novak's precision-made gears mesh with Novak’s HV-Series of Brushless Motors and other brushless motors with a 5mm output shaft. This durable motor and pinion gear combination can be used to power Monster trucks, including the Traxxas® E-Maxx™ and HPI® E-Savage™. The 32-pitch gears are nickel plated to resist corrosion and are designed with ultra-precise concentricity to prevent wobbling. In addition, the gear size is stamped for easy identification and a 4mm x 4mm set screw is included with each gear.