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Car Double Electrode Spark Plugs Ik20 5304. Long Service Life: 4X longer service life compared to standard copper spark plugs. High Performance Material: Features iridium center electrode and 95% pure alumina insulation. Corrosion Resistance: Nickel-plated housing and copper core electrode prevent oxidation. OEM/ODM Acceptance: Customization accepted for thread size and packaging. Quality Certification: ISO 9001 certified with multi-pass factory ignition testing. Stable Performance: V-trimmed ground electrode ensures sharp spark focus and stability. Easy Installation: Original size design fits strict standard processing sizes. Reliable Sealing: Inner sealing with conductivity glass and multi-layer gaskets.