This ESAB OK Autrod 12.51 MIG wire (ER70S-6) is a copper-coated, solid steel wire that provides excellent tolerance to rust and mill scale because of higher levels of manganese and silicon. It is suitable for most carbon steel MIG welding applications and may be used with spray arc, pulsed arc, and short arc welding processes. It is precision-wound with a 0.035-inch diameter and tensile strength of 70,000 PSI, and meets CSA standards. Available in a box as an 18-kilogram spool.