Description Fine wire design delivers improved ignitability and performance life 360 degree continuous laser welded platinum tip promotes durability and long life Tapered ground electrode reduces flame shrouding for improved combustion Nickel-plated shell with rolled threads provides complete anti-seize and corrosion protection 4-year performance satisfaction guarantee gives you miles of worry-free driving Bosch platinum spark plugs are the newest member of OE fine wire spark plug family. Bosch platinum spark plugs are engineered to provide you with improved ignitability and performance. The OE fine wire platinum design delivers optimum fit and function for 2 times longer service life compared to standard copper plugs. And, with a 4-year performance satisfaction guarantee, you're assured lasting performance.