Champion RC14YC (431) Copper Plus Replacement Spark Plug, (Pack of 1) Copper Core Center Electrode: Allows for accurate control of heat range for longer life Maximum Corrosion Resistance: Thanks to a Patented Ultraseal coated shell Dependable and Durable: Built to ISO and SAE standards for proven performance Maximum EMI & RFI Suppression: Patented SAC-9 semi-conductor resistor for ultimate suppression Compatible with the Following Applications: Automotive, Powersport, Small Engine Dependable and durable Built to ISO and SAE standards for proven performance Patented SAC-9 semi-conductor resistor for maximum EMI & RFI suppression Copper core center electrode allows for accurate control of heat range for longer life TinTac and ULTRASEAL shell for best corrosion protection of any spark plug in the industry.