1)The Yttrium- Tungsten Electrode produces a slim arc when used in welding. With a high level of compression, it has a bigger melting depth in medium and high current. It is mainly used in the military, aviatic and astronautic industries.2) color mark: WY20 (blue) 3) other impurity: <0.20% 4) Diameter: 1.0 - 12.0mm5) Length: 50.00, 75.00, 150.00, 175.00mm6) Quality of surface: Polish finish, or ground finish