High-performance spark plugs, NGK Premium RX, set of 4. - Model: LKAR8ARX-PS - Quantity: 4 - Type: Spark plug - Brand: NGK Premium RX Thank you for viewing. I am selling these due to changing cars. They were used for about a year, but they are iridium, so they still have plenty of life left. Everything in the photos is included. They were used without any problems until just recently, but please understand that these are used items before purchasing. Returns are not accepted to prevent swapping, so please understand.