Wire Binding is a very similar technique to spiral binding and is popular in the print of booklets, notebooks, reports, journals, information leaflets, etc.  The process of binding uses a bit of metal coil in the shape of a C and a binding machine. The machine, similarily as in spiral binding – pricks holes along one side of the sheets, puts the wires through the holes and flattens its endings in order to hold the sheets tightly together.