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Iridium has a very high melting point that's perfect for high-performance, high-tech engines. It is stronger than any other metal used in spark plugs. This is a perfect and affordable spark plug option for Focus ST owners looking to go one step colder!Features: - Ultra-fine electrode (thin enough for spark consistency & accuracy, thick enough for max durability & longevity) - Reduces spark voltage requirement - Fuel efficiency & extreme ignitability - Improved throttle response - Outstanding acceleration - Superior antifouling, anticorrosion, and antiseizing properties - Quality NGK Spark PlugsSOLD AS SET OF 4
