Enameled copper wire with a pure copper core and a surface insulating coating. The wire is designed for reliable electrical connections, frequency use, and easy handling. Key points you need to know Color classification in the system refers to wire diameter (spec); the copper wire follows national standard specifications. Specification refers to the diameter of drawn copper wire, i.e., the inner diameter without the paint film. Product type: enameled wire (also known as insulated copper wire). Inner copper core, outer surface insulation with a polyester coating. Packaging: 1 x enameled wire (500 g / 17.6 oz). Technical specifications Voltage resistance: withstands 3000 to 5000 V. Temperature range: 130 to 180 degrees Celsius. Main advantages: can be directly welded, suitable for frequency applications, and easy to carry. What's included 1 x enameled wire (500 g / 17.6 oz) Practical uses and scenarios Transformer and coil winding: suitable for building or repairing transformers, inductors, and other coilbased components. frequency and RF work: effective in RF circuits and frequency applications due to its insulation and durable core. Electronics prototyping and repairs: useful for DIY projects, prototypes, and quick repairs where a strong, weldable copper winding is needed. Why this fits your needs Reliable insulation and durable copper core meet standard specifications for safety and performance. The combination of direct weld compatibility, frequency stability, and portability makes it versatile across hobbyist and professional projects. Clear diameter reference and national standard alignment help ensure you select the right size for your coil, winding, or work.