This is a set of 4 OEM Subaru Platinum Spark Plugs for the 2002 - 2005 2.0 liter WRX. Because they are Platinum plugs, they have a service interval of 60,000 miles.
Please note that these plugs will only fit the 2002 - 2005 WRX. They will not work with the 2006+ WRX, etc.
However, if you are using 2.0 liter heads on an STI block, you will still need to use these sparkplugs.