Brisk's Iridium Racing Spark Plugs are 6x harder and 8x stronger than platinum and offer a 1200 degree higher melting point. Iridium is an extremely durable material that extends the spark plug lifetime by reducing spark plug gap erosion. Iridium racing spark plugs feature Power Focus Technology, which helps direct air/fuel mixture during the compression stroke directly to the spark. This special “tapered shell reflector” also helps direct the propagating flame front to the center of the combustion chamber, maximizing power and insulating from thermal shock. Iridium racing spark plugs utilize a 1mm diameter spark plug iridium center electrode tip, capable of displacing more heat than smaller diameter tips. Iridium racing spark plugs are the ideal choice for power demanding applications.