The punched tape concertina / razor barbed wire has the following advantages over the conventional barbed wire: It has sharper barbs (blades), the blades are not prone to sagging and since both their sides are flat, in addition to the zinc coating already provided, one can easily coat them with anti-corrosive red oxide or paint to increase the life many-fold.
One kilogram of the punched tape concertina / razor barbed wire measures approximately 12 meters in length.