Feature Benefit   Revolutionary firing technology Delivers a longer and more powerful spark for ultimate performance   Unique four-ground electrode design Longer service life, and optimal access to air/fuel misture for the most efficient combustion Pure platinum center electrode, heat-fused into an extended insulator Smoother acceleration, peak fuel efficiency, maximum engine and a longer performance life  Factory pre-set gap Ease of installation - never requires adjustment   Yttrium alloy ground electrodes Longer performance life. You'll feel the difference with Bosch Platinum+4 guaranteed! Bosch guarantees that you will feel the improved performance in your vehicle when you use Bosch Platinum+4 Spark Plugs. If you do not expreience smoother acceleration, improved fuel efficiency and optimal engine performance, return the spark plugs with your dated sale receipt, and Bosch will refund the purchase price of the spark plugs.   Advanced technology and the most powerful spark plug you can buy. Four ground electrodes provide multiple radial spark paths, which allow the spark to find the most efficient spark path. Platinum+4 delivers a longer and more powerful spark than a conventional single electrode spark plug.   Bosch Platinum+4 features a "pure platinum" heat-fused center electrode, which allows it to reach its self-cleaning temperature faster, delivering smoother acceleration, peak fuel efficiency, and a longer performance life.   Never before has there been a spark plug with such superior qualities since Bosch first introduced "pure platinum" spark plug technology in 1985.   Try Bosch Platinum+4 Spark Plugs, and ignite your car's performance with the most powerful spark plug you can buy.