Ruthenium HX™ brings the most advanced spark plug technology to the automotive aftermarket, delivering better efficiency and power for the Mazdaspeed Platform
 
You'll get almost twice the amount of spark compared to iridium and increased durability thanks to the new Ruthenium Design!
 
THE NGK DIFFERENCE
PSPE® tip designs
Superior oxidation resistance
Advanced high-ignitability technology
Enhanced blistering/anti-peeling
 
Irridiums will get you roughly 5000-8000kms out of a good set, due to the increased durability of the Ruthenium Plugs you'll get 8000-12,000kms!
 
Price is for a set of 4