Hot galvanized wire gabion box It is made from high grade Low Carbon steel iron wire, heavy zinc coated wire, PVC coated wire though twisting and braiding by machine. as well as galfan coated units. Galfan is a high performance galvanising process using a zinc/aluminium/mischmetal alloy coating. This offers significantly greater protection than traditional zinc galvanizing. Where the product is exposed to water courses or a saline environment, we strongly recommends a polymer coated galvanized unit for improved design life.