electrode to get even longer service life

This product uses 0.6mm iridium alloy center electrode. 
A larger center electrode means a greater cooling effect and poorer ignitability. On the other hand, the 0.6mm diameter iridium center electrodes have an extremely small cooling effect, reducing misfiring and realizing good 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 ignition system, it affects the life of the vehicle. With its 0.6mm center electrode that keeps the required voltage low, it can be said that the Torch iridium platinum plug is a car-friendly spark plug.