Lincoln Electric SuperArc L-56 MIG Wire (.030, 12.5 lb)

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MIG wire shows up on price first, but the cheap stuff costs you on every bird-nest, burnback, and silicon-island. SuperArc L-56 is Lincoln's premium copper-coated ER70S-6 wire — the copper coating reduces friction through the gun liner so feed stays consistent across long runs, the chemistry tolerates surface contamination (mild rust, mill scale) better than budget wires, and the silicon islands left on the bead are smaller and break off cleaner. Runs in any MIG machine. The .030 diameter on a 12.5-pound spool is the most-asked-for size in our catalog.