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Main Spark Plug Automobile and Motorcycle Accessories Spark Plugs B7tc. Customization Options: Supports customization from samples, designs, and flexible minor customization. High-Quality Materials: Uses high-alloy ceramic insulators and anti-corrosion metal shells for durability. Certified Quality: Certified with TS16949, ISO9001: 2000, and CE standards. Professional Testing: 100% professional testing ensures quality before delivery. Wide Compatibility: Suitable for all car brands, models, and engine types. Fast Delivery: Delivery time is usually 15-25 days, with 7 days for main sizes.