This enamel coated solid copper wire is also called magnet wire. It is commonly used for making coils for electromagnets and electric motors. You get a 4-ounce roll of 28 gauge wire that is about 400 feet long. The diameter of 28 gauge copper core is quite small: 0.0126" or 0.321 mm.
NOTE: Actual product may vary from the one pictured due to differences in suppliers.
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