NGK PremiumRX spark plugs, BKR5ERX-11P, set of 4. Brand new, unused. Features the world's first "ruthenium-infused center electrode" and a "platinum-tipped + oval-shaped" outer electrode. Achieves outstanding ignitability, and is a next-generation premium spark plug that maximizes total performance, including low fuel consumption, fouling resistance, and long life. Price is not negotiable. Please refer to the profile section. For details, please refer to the manufacturer's website: ttp://www.ngk-sparkplugs.jp/products/sparkplugs/rx/index.html Free shipping nationwide. Also, please refer to the manufacturer's website for vehicle compatibility information. Compatibility search site: http://www.ngk-sparkplugs.jp/search/index.html