I've heard stories about some wire being dirty as you can say. It has to be cleaned with what I don't know prolly alcohol. Just wipe the wire with a paper towel and see. Many place may buy cheap wire by the mile then respool it and again I don't know and can't accuse any vendor of doing that. I've only bought Temco wire and never bought any other brands. To some wire is wire so buy whats easiest to get. I would seriously be leary about Fasttech wire, their reputation for seconds and clones is too much for me to have confidence to use some of their products.