1) Multi-ribbed insulator eliminates flashover,2) 95% pure alumina insulator,3) Strong resistance to heat and shock,4) Great mechanic and electronic features,5) Superb insulation,6) Nickel plated housing prevents oxidation and corrosion,7) Heat crimping process ensures absolute air-tight fit,8) Inner sealing with conductive glass ensures a fine conductivity and seal,9) Multi-layer gaskets are strong and reliable,10) Copper core electrode prevents oxidation and corrosion,11) Good electricity and heat conductivity,12) Long spark plug service life.