Description Platinum firing pin and yttrium enhanced ground electrode provide 2X longer service life compared to standard copper plugs Fine wire design provides better ignitability and performance 360 Degree continuous laser welding to fuse the platinum firing pin for increased durability 4 year performance satisfaction guarantee Original equipment, pre-gapped replacement delivering optimum fit, form and function Bosch OE Fine Wire Platinum Spark Plugs deliver improved ignitability and fuel efficiency. The fine wire design with a platinum firing pin on the center electrode and tapered ground electrode are an economical upgrade from conventional copper core 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. Engineered to meet or exceed Original Equipment specifications for platinum spark plugs.