Corrugations
Corrugations below tip prevent flash over

Special Packing
Excellent air tightness and robust constrution

Insultator
Made of high quality purity alumina providing better head dissapation, higher electrical insulation and stronger thermal shock resistance

Metal Shell
Zinc-plated and chromated metal shell guards against corrosion

Copper Core
Deeply inserted in the centre electrode for improved thermal conductivity, providing an ultra wide heat range plug that gives maximum performance at both high and low speeds

Centre and Ground Electrodes
Special nickel alloy ensures superior heat resistance and durability

Ceramic Resistor
Generally a 5k ohms ceramic resistor to supress radio freqency noise protecting car radios, mobile phones and engine management systems