 Copper wire is offered in gauges 14, 16, and 18. Other thicknesses of copper wire are often available at local hardware and craft stores. Wire is sold by the foot in lengths 1', 2', 3', 4', 6', and 10'.
14 gauge copper is 1.60mm thick.
16 gauge copper is 1.30mm thick.
18 gauge copper is 1mm thick.
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