、Appearance: The tungsten wire is regular black covered with graphite. After graphite removed it is metallic luster. 2、 Specifications: 10?5w,25?0w,100-200w,300-1000w. purity quantity:99.95% 3、 Application: For producing electric light source parts and electric vacuum components; For producing heating elements and refractory parts in high temperature furnaces; For producing heating elements used in vacuum metalizing or plating.