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Fine wire center electrode ensures high durability and a consistently stable spark. Ngk iridium ix spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs—and just thin enough to create an. Ngk iridium ix spark plugs utilize a .6 mm iridium center electrode & taper cut ground electrode for faster starts, better acceleration & improved anti-fouling.