The Champion Copper Plus Marine Spark Plugs L78YC 936M Set of 4 are high-quality spark plugs designed for direct replacement in marine engines. With a 90-day warranty, these spark plugs are made of durable copper material and are engineered to provide reliable ignition performance. The set of 4 spark plugs ensures a complete replacement for optimal engine performance. Trust the Champion brand for quality and reliability when it comes to maintaining your marine engine's ignition system.