This listing is for a 4-pack of Torch Takumi Spark Plugs. These performance spark plugs are designed to replace NGK BMR6A (7421) and many other compatible spark plugs. They are suitable for various applications, including fitting Tanaka Tob 12 Outboard motors. The part number for these Takumi spark plugs is BM6RSC. They are compatible with numerous other spark plug brands and models such as AC Delco CS45, AC Delco CSR45, Autolite 245, Autolite 255, Autolite XST255, Beru 14SR-7E, and Beru Z271, among others.