Thank you for viewing. This is a set of 4 NGK Premium RX spark plugs, model BKR6ERX-PS (92220), for the Copen, model L880K. I purchased and installed these because I self-diagnosed that the ignition coil or spark plugs were bad due to engine trouble in my L880K Copen. However, the engine didn't improve, so I removed them after driving about 20 kilometers. I purchased them on Amazon for ¥5,910. I have discarded the product packaging. No returns or exchanges, please.