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China Factory Supplier OEM 9723 Silzk7rb11 Automotive Spark Plug. Extended Service Life: 4X longer lifespan compared to standard copper spark plugs. Premium Iridium Electrode: Iridium center electrode delivers maximum life and stability. High Heat Resistance: Insulator made of 95% pure alumina, resistant to heat shock. Corrosion Protection: Nickel-plated housing prevents oxidation and corrosion. OEM Standard Fit: Original size installation strictly according to car standards. ISO9001 Certified: Manufactured with strict quality control and multi-pass tests.