Ningbo Marshal Auto Parts Co., Ltd., is a research and development, production and sales of professional manufacturers of spark plugs. Our company’s spark plugs are mainly used in gasoline, natural gas and liquefied petroleum gas as fuel for all types of automobiles.In manufacturing, it also has a ceramic factory,ceramic Insulators are completely self-produced,high density of insulator, better dielectric strength,thicken design of insulator nose, better mechanical strength which can satisfy modern engine well.Secondly,electrodes have better electrical conductivity, better heat resistance, better heat dissapation, better ablation resistance.Shells have better malleability,better toughness, higher hardness which can reduce shell breaking and help the shell for better heat disappation.