Bosch 6709/HR8DPP30V Platinum Spark Plugs are engineered to extend performance life and durability. The fine wire design of the center electrode improves ignitability and performance in your engine while the Platinum tip on the center provides a 2X longer service life compared to standard Copper plugs. Nickel plated, rolled threads, combined with a factory preset gap, ensure simple, easy installation right out of the box - no anti-seize or gapping necessary.