Made from extremely strong spring steel.nCnc machined and lightened for precision and efficiency.nMilitary grade hard coating for increased hardness and life.nLaser etched with number of teeth and pitch for easy identification.nAdvantage racing products have won multiple roar national championships.nAdvantage Racing Products Mod 1 Pinion Gears are extremely high quality. They are made from Premium Spring Steel and CNC Machined and Lightened for maximum precision and efficiency. The Gears are then Hard Coated to achieve a HRC 55 hardness rating, and Laser Etched with the size for easy identification.