Bosch 8121 Double Platinum Spark Plug, Up to 3X Longer Life (Pack of 1) Double Platinum firing pin and ground electrode inlay provide 3X longer service life compared to standard copper plugs Fine wire design provides excellent ignitability and performance 360 continuous laser welding to fuse the platinum firing pin for increased durability 5 year performance satisfaction guarantee Original equipment, pre-gapped replacement delivering optimum fit, form and function