NGK (3066) CMR7H Standard Spark Plug, Pack of 1 Manufactured in Japan Easy to use Highly durable Solid copper core for greater spark Longer insulator nose prevents fouling Corrugated ribs on insulator prevents flashover Zinc dipped shell prevents corrosion Triple gasket seal eliminates combustion gas leakage Solid copper core for greater spark Longer insulator nose prevents fouling Corrugated ribs on insulator prevents flashover Zinc dipped shell prevents corrosion Triple gasket seal eliminates combustion gas leakage