Package Included:
4X Iridium Spark Plugs

Benefits of Iridium Spark Plug:

improve the acceleration profile
experience more engine power
improve your fuel economy
requires less voltage than other designs
more durability
more corrosion resistance
Important note:1.If you decide to go for iridium plugs, do not touch or try to adjust them. There's a high chance that you'll break the more delicate tip. They come pregapped, so just check whether everything's alright.
2.There's trivalent plating on the spark plug threads,Don't put anti-seize on them.This will affect the torque values and you might mess things up.