This is 1/2/5M pure copper wire of T2 copper, also known as red copper line, with a purity of 99.9 percent. It is bare wire and is available in a range of diameters including 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.5, 3, 4, and 5 mm. The size shown here is OD 0.3 mm with a length of 5 meters. Key benefits and features - High purity copper for reliable conductivity 99.9% purity in T2 copper provides good electrical conductivity and consistent quality across applications - Bare copper wire No insulation, suitable for direct soldering and terminations where insulation is not required - Wide size options Available diameters cover a broad range of projects and connection needs - Compact length option 5 meters in a compact 0.3 mm diameter size offers convenient supply for small assemblies and prototyping - Consistent performance Designed for stable electrical performance in diverse electrical and electronic projects Specifications and suitability - Material: T2 copper (red copper line) - Purity: 99.9% - Wire type: Bare copper wire - Available diameters: 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.5, 3, 4, 5 mm - Selected size: OD 0.3 mm, length 5 meters Use scenarios - Coil winding and inductors Suitable for winding small inductors or custom transformer coils in hobbyist or light-duty engineering projects - Soldering and prototyping Ideal for direct wire connections in prototypes, test jigs, and experimental electronics where insulation is not required - Repairs and internal wiring Useful for internal connections and non-insulated wiring tasks in devices, equipment, or fixtures where bare copper is appropriate Notes - This product is a bare copper conductor and does not include insulation - Choose from the listed diameters to match connection requirements and current handling demands for your project The description remains true to the original specifications while presenting clear, customer-focused benefits, practical use cases, and straightforward sizing information.