Black iron wire, Also known as black annealed iron wire. It’s made of low-carbon steel wire. Used for tie wire or binding wire in construction. Specification: BWG3-38 (0.17MM~6.5MM) Weight/coil 0.1KG~800KG/coil Packing 1.Plastic inside, PVC weaving bag outside 2.Plastic inside , hessian cloth outside