IRIDIUM POWER
For drivers that care about performance.
By using a 0.4mm diameter iridium alloy center electrode and a special ground electrode, IRIDIUM POWER realizes spark performance unseen until now. It steadily gives a high level of response under a variety of driving conditions. The result? Increased acceleration and torque compared to regular plugs.

IRIDIUM TOUGH
For long distance and heavy-use drivers.
By greatly minimizing electrode wear, DENSO improved mileage and extended the plugs useful life. Longevity provides you with peace of mind and safety when using IRIDIUM TOUGH.

IRDIUM PLUG
This product, the first in the world, uses 0.4mm iridium alloy center electrode.
A larger center electrode means a greater cooling effect and poorer ignitability. On the other hand, the 0.4mm diameter iridium center electrodes have an extremely small cooling effect, reducing non-firing and realizing assured ignitability, the basic function of a spark plug.  Also, because taxis use liquefied petroleum gas (LPG) as fuel, a large electrode increases the required voltage, and because this places a larger load on high tension cords and coils, it affects the life of the vehicle. With its 0.4mm center electrode that keeps the required voltage low, it can be said that the IRIDIUM PLUS, is a car-friendly spark plug.

IRDIUM RACING
It's the age of iridium electrodes. Discover more acceleration with 0.4 mm DENSO Racing Plugs. DENSO would like you to try the 0.4 mm IRIDIUM RACING advantage. Use IRIDIUM RACING and experience a ride like never before.