CMD355079 Single Core 0.71mm diameter Copper Wire. Range of tinned copper wire supplied handy plastic spools. The annealed single strand copper wire benefits from a thin tin plating making the copper wires robust and resilient to moisture. Tinned copper wire is particularly useful where excellent electrical conductivity and thermal resistance is required, suitable for use as rewirable fuse links and shorting links. The RS Pro range of copper wire is available in various diameters and AWG sizes. All models are highly reliable and excellent quality.