Denso Iridium Spark Plug

Six times harder than platinum, iridium withstands temperatures up to 4,000DegreeF
Because the iridium electrodes of these plugs can be shrunk to only 0.4mm, voltage requirements decrease while firing performance improves
360Degree laser welding of electrode provides a seal that resists wear even in the worst conditions
Ground electrode features a tapered cut and U-groove that form a large volume area for the flame's center