Bosch ZR7SI332S Iridium Spark Plug, Up to 4X Longer Life (Pack of 1) Tapered ground electrode with laser-welded iridium platinum alloy inlay provide 4X longer service life compared to standard copper plugs Ultra fine wire design provides superior ignitability and performance 360 continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability 7 year performance satisfaction guarantee Original equipment, pre-gapped replacement delivering optimum fit, form and function