Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, Autolite Platinum spark plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability. Warrantied for 4 years. Consider upgrading to Autolite Double Platinum or Iridium XP spark plugs for increased performance. Autolite is an Official NASCAR Performance Partner.