Binding covers are used as the first and last page of bound documents. They are typically made of materials that are stronger than paper, such as PVC, cardboard or leatherboard. They provide a professional look to your bound documents while acting as a protective cover. Benefits of comb binding Comb binding is a relatively cheap and easy way of binding pages together into a book. One advantage of comb binding is the ability to easily remove pages or add additional pages. Binding covers can also potentially be reused.