NGK Spark Plug for MAZDA, Rx-7, Rotary - BR10EG (Pack of 4) Engine: 13B Gap: 0.8 Established in Japan in 1936, NGK is one of the world's foremost spark plug and glow plug manufacturers. From passenger cars and bikes to Formula 1 and motorcycle racing, NGK has established itself as a heavily relied upon original equipment manufacturer (OEM). NGK's family of automotive products are driven by extreme dedication to innovation, and synonymous with uncompromising performance and quality. Guaranteed against faulty components and workmanship Original names and numbers are used for reference purposes only. Safety-critical parts to be fitted by Qualified Technicians in an approved workshop. What's in the box Box of 4 Plugs