Brand new set of (10) NGK BZ7HS-10 Stock #3579 Spark Plugs. 10 PACK Trivalent Metal Plating Provides Superior Anti-Corrosion And Anti-Seizing Properties Corrugated Ribs Prevent Flashover Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength And Better Heat Transfer Copper Core Aids In Heat Removal