The concertina wire is one of the most common and tough solutions for forming obstacles. These wires are used both in residential areas and military pockets. This is a specialized kind of barbed or razor wire which usually possesses a large coil like structure. This can often be expanded into a concertina like shape. In tandem with 

regular barbed wire and pickets made of steel, concertina wires are used for forming obstacles in military pockets. These wires have an illustrious history of their own and were initially manufactured by soldiers themselves during the World War I period. They made use of regular barbed wire to put up concertina obstacles.