The Unipart Surefire GSP4563X Copper Core Spark Plug is a pack of 4 high-quality spark plugs designed for vehicle ignition systems. Manufactured in Japan by Unipart, these spark plugs feature a durable copper core material that ensures reliable performance. With the manufacturer part number GSP4563X, these spark plugs are a trusted choice for maintaining optimal engine function and efficiency in your vehicle. Upgrade your vehicle's ignition system with these reliable Unipart spark plugs.