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China Factory Supplier Spark Plug OEM Silzk7rb11 9723 Automotive Spark Plug. Iridium Center Electrode: Delivers maximum service life and superior performance. 4X Longer Service Life: Lasts 4 times longer than standard copper spark plugs. High Heat Resistance: Insulator made of 95% pure alumina for shock resistance. OEM/ODM Accepted: Customization available for thread size and packaging. Corrosion Resistant: Nickel-plated housing and copper core prevent oxidation. Stable Spark Performance: V-trimmed ground electrode ensures sharp spark focus. Strict Quality Control: Multi-pass factory ignition tests ensure product qualification. Easy Installation: Original size design fits standard car processing sizes.