OEM replacement for leading and trailing spark plugs for the Mazda RX-7 Rotary Engine 13B Turbo 
II & 13B-REW.
Excellent for Stock port / Street ported motors.
NGK Laser Platinum® spark plugs provide high ignitability and longer service life. Dual platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions.
Sold as a set of 4: 
2 x BUR7EQP
2 x BUR9EQP