Set of 4 NGK spark plugs, offering reliable performance. - Brand: NGK - Quantity: 4 - Package Color: Yellow Thank you for viewing. Recently, the ignition system wasn't running well, and I suspected the plugs were worn, so I bought these for replacement. However, the problem was elsewhere, so I used them only once and no longer need them, so I'm putting them up for sale. Most of the dirt has been removed with parts cleaner. One of the boxes has a torn part and can't be closed.