Tungsten, as a high performance material, has unique properties: highest melting point, low vapor pressure, low coefficient of thermal expansion, Tungsten bars or rods is often used for producing ion implantation parts. Tungsten electrode, electric light source parts and electric vacuum components. In high temperature furnace,tungsten rods or bars is used in producing heating elements and heating parts. Surface Finish Black - Surface is "as swaged" or "as drawn"; retaining a coating of processing lubricants and oxides. Cleaned - Surface is chemically cleaned to remove all lubricants and oxides. Ground - Surface is centerless ground to remove all coating and to achieve precise diameter control. Wooden case.