Enamel Copper Winding Wires 100 grams
Measurement:Thickness : 0.5mm (25SWG)
Approximate Length : ~36M
Enameled wire is wire (such as magnet wire) coated with a very thin insulating layer.
It is used in applications such as winding electric motor coils, speakers and transformers.
It is also used in the construction of electromagnets and inductors.
The core material is copper or aluminum, coated with a thin layer of a polyurethane, polyamide, or polyester etc resin - the so-called "enamel". Aluminum is lighter than copper, but has higher resistivity" - Wikipedia