"Lincoln Electric SuperArc L-56 MIG Welding WIre offers superior feedability and excellent arc characteristics for exceptional MIG welding results. Premium copper-coated mild steel wire in a 12.5-lb. spool. Product Type Welding wire, Compatible With MIG welders, Weight lbs. 12 1/2, Welding Processes Welding on metals with a medium to high presence of millscale, Wire Size in. 0.030, Wire Material Copper-coated MIG wire. 0.030 in. dia. wire Excellent choice for welding on metals with a medium to high presence of millscale For best performance use on clean, oil-free, and rust-free base material"