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Auto Spark Plug High Quality Factory Direct Sale Iridium Spark Plugs 9723 Silzk7rb11. Iridium Center Electrode: Delivers maximum service life compared to standard copper plugs. 4X Longer Service Life: Lasts four times longer than standard copper spark plugs. High Purity Alumina Insulator: Made of 95% pure alumina with high heat shock resistance. Nickel-Plated Housing: Prevents oxidation and corrosion with heat-crimped gas-tight fit. OEM/ODM Acceptance: Customization services accepted for thread size and design. ISO9001 Certified: Manufactured under strict quality control standards. 12 Months Warranty: Comprehensive warranty coverage for 12 months from purchase. Precious Metal Materials: Ensures strong ignition and stable performance.