Spark plugs Features: 1 Multi-ribs of insulator eliminates flash-over 2 Insulator made of heat alumina, strong resistant to heat shock, great mechanic and electric features and super insulation 3 Nickel-plated housing prevents oxidation, corrosion, heat crimping process ensures absolute gas-tight fit 4 Inner sealing with conductive glass ensures fine conductivity and sealing 5 Multi-layer gaskets are elastically strong and reliable in sealing 6 Copper core electrode prevents oxidation and corrosion, good electric, heat conductivity and long spark plug service life 7 Various spark plugs for both automobile and motocycle of different vehicles.