Concertina Razor Wire is formed in large coils which can be expanded like a concertina, and it belong to a type of barbed wire or razor wire. At the very beginning, it is used to form military wire obstacles in conjunction with plain barbed wire and steel pickets. During World War I concertina wire was mainly produced by soldiers themselves for military uses. In modern times, it is mainly produced by professional razor wire manufacturers. On the part of the packing terms, it is packaged in coils of various diameters