Up for sale is NGK 747 BPM6A SPARK PLUG SHOP PACK 25 747. The vendor part number is 747. Please read title to know what you are getting. The catalog decription.... is NGKs wide heat range results from using copper wire in place of the iron cores found in many conventional plugsCopper dissipates heat quicker, cooling the electrode and insulator tipRaised pre-ignition rating with high conduction copper and long nose insulatorEach meets the requirements of high-performance engines