Blueshield Tungsten for Precision TIG Welding. Available in five tungsten types. Come in a variety of industry standard diameters. Offer the highest quality standard in the industry (composed of either pure tungsten or an alloy of tungsten and other elements and oxides). Are color-coded to eliminate confusion over type. Blueshield tungsten electrodes are ground finished to provide maximum smoothness and consistency. Length of all tungsten electrodes is 178 mm (7”) packaged of 10 electrodes per box. Good current capacity, arc stability and easy arc start on DC current. High-resistance to weld pool contamination. Maintains sharpened tip configuration. Not normally used on AC current because it is difficult to maintain the balled end.