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Improved wear resistance and, together with the iridium alloy center electrode, improved ignitability. The shortened tip enables a tapered shape and secures a larger space volume. Shortened electrode length and optimized cross-sectional shape increase the cross-sectional coefficient while reducing mass. This contributes to improved strength and durability of the grounding electrode. Carbon buildup caused by prolonged idling and various combustion environments, including air ratios, can degrade insulation and cause misfires. By placing a thermo-edge at the tip of the insulator, micro-discharges are generated to burn off accumulated carbon and ensure constant insulation. Narrows the gap between the insulator at the tip and the ground electrode to generate a discharge, which, like the thermo.