Experience unparalleled performance with the NGK Racing Spark Plug Box of 4 (R7420-9). Specifically engineered for extreme racing conditions, these spark plugs are the choice of champions across the globe. With their unique configurations, NGK Racing spark plugs ensure superior ignitability and durability, making them perfect for any high-stakes racing environment. Designed to cater to a broad range of racing applications, these spark plugs are built to withstand the rigors of competition. Whether you're a professional racer or a weekend enthusiast, trust NGK to deliver optimal performance and reliability. Elevate your engine's efficiency and power output with NGK's trusted racing technology. <b>Features:</b> * Extreme durability: Built to withstand rigorous racing conditions: Extreme durability: Built to withstand rigorous racing conditions * Superior ignitability: Special configurations for reliable performance: Superior ignitability: Special configurations for reliable performance * Versatile applications: Suitable for a wide variety of racing environments: Versatile applications: Suitable for a wide variety of racing environments