Wire-O binding supplies (also called double-o or twin-loop wires) use a continuous hinge of double loops of wire to hold book covers and pages together. Wire binding is popular among graphic designers and offers a stylish metal finish in a variety of colors. This traditional, yet modern method of wire binding secures pages so that they cannot be modified without de-binding the book. Books bound with Wire-O binding spines lay flat and the sheets are able to turn 360°, making it the perfect solution for calendars and notebooks. Available in a large variety of colors, as well as 3:1 or 2:1 pitch (holes per inch). 11" wire bindings are the standard length for letter size documents. For different size documents, spools of continuous wire or custom-cut wire can be purchased. Contact us for more information on custom-cut wires.