Product type: enameled wire, also known as insulated copper wire. Core is pure copper; surface insulating paint with a polyester patent leather outer layer. Packaging: 1 piece per pack; 500 g (17.6 oz). Size and classification notes: Color classification shown by the system corresponds to wire diameter/specification. Gauge refers to the diameter of the bent copper wire, i.e., the inner diameter without paint film. Copper wire meets national standard specification. Construction and materials: Inner layer: pure copper. Insulation: surface insulating paint. Outer layer: polyester patent leather. Electrical and thermal ratings: Voltage rating: 3000 V to 5000 V. Temperature resistance: 130 to 180 degrees Celsius. Direct weldability: can be welded directly. Suitable for frequency resistance tasks. Portable and easy to carry. Key benefits: Reliable insulation and durable outer coating for voltage scenarios. Direct welding capability reduces preparation steps and speeds up assembly. National standard specification ensures consistent quality and compatibility. Lightweight and portable for onsite or field work. Practical applications: Coil winding for transformers and inductors where insulation and voltage tolerance are required. frequency resistance welding projects that benefit from directly weldable enamel wire. Electronics prototyping, hobby projects, repairs, and small electrical assemblies requiring insulated copper conductors.