Bosch 9601 Double Iridium Spark Plug, Up to 4X Longer Life (Pack of 1) Did You Know? Bosch invented the first spark plug in 1902; with more than 115 years of continuous innovation, Bosch has produced over 11 billion spark plugs while developing over 20,000 types 0.6mm fine wire firing pin 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