High-performance spark plugs using ruthenium electrodes, offering improved wear resistance and ignitability. - Brand: NGK - Model: LTR6ARX-13P - Quantity: Set of 4 - Features: New ruthenium-containing electrodes, improved wear resistance, oxidation resistance, and ignitability. - Made in: Japan Compatible with NC Roadster, etc. Although new and unused, there are sticker residue marks on the box. Please purchase only if you understand this.