The Champion Copper Plus 824 Spark Plugs UL18V are a set of 4 genuine Champion spark plugs designed for direct replacement in vehicles. Made with copper material and a voltage of 18V, these spark plugs are known for their reliability and performance. With a length of 3.750 inches, these spark plugs are ideal for fitting into the ignition system of cars and trucks, providing a quality and durable solution for maintaining optimal engine function.