1.Multi-ribs of insulator eliminate flashover. 2.Ceramic insulator provides stronger resistance against thermal shock,greater mechanic and electric strength and reliable insulation. 3.Nickel plated housing prevents oxidation and corrosion,heat crimping process ensures absolute gas-tight fit. 4.Inner sealing with conductive glass ensures a fine conductivity and sealing. 5.Multi-layer gaskets are elastically strong,and reliable in sealing. 6.Copper core electrode prevent oxidation and corrosion,good electric and heat conductivity ,long spark plug service life.