ProClick Easy-edit Binding Spines are fast and easy to use. Each opens and closes with a special tool for quick edits. Pages lie flat for 360 degree rotation. You can use this spine with any GBC WireBind binding system or with the pre-punched paper if you don't have a binding machine. Perfect for customer presentations and proposals, and documents that require multiple edits/updates. Binding spines are designed for letter-size documents and made with a high percentage of recycled material.