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 Degree continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability. This product comes with a 7 year performance satisfaction guarantee and is an original equipment, pre-gapped replacement delivering optimum fit, form and function. Fits: 2011 Chevrolet Volt, 2003-2012 Maybach 57, 2003-2012 Maybach 62, 2003-2014 Mercedes-Benz CL600, 2005-2006,2008-2014 Mercedes-Benz CL65 AMG, 2016-2017 Mercedes-Benz G65 AMG Fits: 2016-2017 Mercedes-Benz Maybach S600, 2004-2011 Mercedes-Benz SL600, 2005-2011,2013-2017 Mercedes-Benz SL65 AMG, 2003-2013,2015-2017 Mercedes-Benz S600, 2006-2013,2015-2017 Mercedes-Benz S65 AMG.