Wire bindings hold far fewer pages than plastic binding. Wire is a series of parallel wire loops attached along a wire, while spiral binding is a metal or plastic continuous loop passing through the punched holes in a spiral from the top to the bottom of the book. The big advantage of this binding method is that you can print on the spine.
Wire is a traditional 3:1 and 2:1 pitch wire binding option. Available in a wide variety of colours, wire binding gives all your bound documents a classic look. It can accommodate a page count for 3:1 wire of 240 pages (120 leaves), 2:1 wire of 480 pages (240 leaves).