Bosch Double 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 electrode and platinum inlay on the ground electrode deliver a 3X longer service life than standard copper plugs. This design reduces gap erosion and increases durability and performance life while meeting original equipment specifications for double platinum spark 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.