NGK Premium RX Spark Plugs, Set of 4. High performance for improved engine efficiency. - Brand: NGK - Model: Premium RX - Type: Spark Plugs - Quantity: Set of 4 Thank you for viewing. I tried to replace the spark plugs in my car, but realized the model number was different after installing one. Therefore, only one plug has been installed once, and some dirt from the engine side has adhered to the threads. There is no problem with use. - Immediate purchase ○ - Price negotiation ○ - No refunds or returns ✕