Iridium TT spark plugs offer improved horsepower and reduced fuel consumption

0.4mm diameter iridium alloy center electrode

0.7mm needle-type platinum alloy ground electrode

Iridium tip is fully protected by a laser welding

Reduced CO, CO2 and HC emissions due to improved ignition spark

Built-in resistor to eliminate electromagnetic noise interference

Lasts beyond 100,000 miles for ultimate endurance