Black Wire is made of low carbon steel or iron wire, in the home and construction often used for weaving, packaging. For example, hay is made in agricultural areas. Black annealing wire is mainly processed into coil wire, wire axis or large wrapping wire. Or further straightened and cut into tangents and U-lines. With good elasticity and flexibility, it can control the degree of softness and hardness in the annealing process, mainly used for binding silk and binding wire in the construction industry.