Platinum is one of the most durable metals used in spark plug tips today. Due to its durability, it virtually reduces all gap erosion, which will give you better performance and the benefits of: Quicker starts Fewer misfires Faster acceleration Smoother idle There are two ways to get platinum into your spark plugs: Single platinum plug, which has platinum tip on the center electrode. Double platinum plug, which has platinum tip on the center and side wire. Double platinum helps enhance performance in the newer high-tech ignition systems. Money-Back Guarantee: We are confident about how well Autolite® Platinum and Autolite® Platinum Pro® spark plugs will perform, that we offer a money-back guarantee for 5-years on Platinum Pro® plugs and 3-years on Platinum plugs - no matter how many miles you drivePit Stop USA offers Autolite Racing Spark Plug AR24 AR24 at low everyday prices. Be sure to check out all of our products from Autolite Spark Plugs including Autolite Copper Core Spark Plugs.