Precision layer wound wire, you'll have no issues whatsoever,
Its rubbish. It splays out were its broke and when the outside strand is pulled it slides down the side and jams.
I always open all mig wires in the shop if I buy local, I've been caught out too many times and they look at you as if to say I think you broke it.
Its not worth the hassle messing about with it.
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