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Char the end of the cotton cord and pull the tip into the protective copper tube before you take it out in the field. When you go to light your fire, cast your sparks or burning lense at the charred end and use it like a match to start your fire.
We could warn you that the copper tube may get hot if you don't let the charred end cool before pulling it back. But if you need us to tell you that fire makes metal hot, this probably isn't the product for you.