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| Nickel-plated rolled threads |
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| Guaranteed to deliver smoother acceleration and improved fuel efficiency |
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| Bosch exclusive heat-fused center electrode for improved cold starts and resistance to fouling |
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| Yttrium-enhanced ground electrode(s) |
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| Revolutionary surface-air gap technology |
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| Factory preset gap never requires adjustment |
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| Fused iridium and platinum-center electrode |
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| Platinum center electrode with the most platinum vs. Platinum Plus |
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| Platinum center electrode with more platinum vs. Platinum Plus |
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| Platinum center electrode |
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| Yttrium-enhanced copper core center electrode |
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