NGK 2382 BKR5ES-11 Standard Spark Plug, Pack of 1 Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties Corrugated Ribs Prevent Flash over Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer Copper Core Aids in Heat Removal Triple Seals Prevent Leakage 45 degree V-Power center electrode increases anti fouling characteristics and performance Increased fuel economy and lower emissions Lowers ignition system voltage requirements Greater ignitability and performance over conventional spark plugs Trivalent metal plating has superior anti-corrosion and anti-seizing properties