A distributors performance is only as good as its drive gear MSD ignition has put a great deal of effort into researching and testing a variety of metallurgical compositions, heat treating and coatings to provide you with a durable, accurate and strong distributor gear MSD engineers have built test fixtures and spent hundreds of hours testing and evaluating the metallurgy of our gears The result is a special iron alloy gear that is treated to a low-friction coating process To you this means long life, an easy break-in period and reliable performance