NGK Iridium spark plugs have been specifically developed for improved spark performance and superior anti-fouling properties ideal for performance enthusiasts.Outstanding acceleration, high fuel efficiency and durabilityFine Iridium tip for consistent spark performanceCold-rolled threads prevent cross-threading and damage to cylinder headsTrivalent plating eliminates the need for anti-seize compoundsHigh-grade alumina silicate ceramic quickly dissipates heatEach and every spark plug manufactured by NGK is designed to meet the most rigorous standards, ensuring the ability to deliver reliability and consistent performance under all conditions. Each plug plays a major role in helping improve performance, fuel economy and the overall optimum efficiency of your engine, helping to make a significant contribution in the reduction of emissions.NGK uses 98% pure Copper in place of the iron core found in conventional plugs and is the secret to their wide heat range. The Copper core electrode pro