Endsheets, or endleaves, of a book refer to the pages at the beginning and end of hardcover books. They are typically made of a thicker stock that fortifies hardcover books and adds durability. Endsheets are printed as a two-sheet spread. One side of the spread is glued down on the inside back and inside front cover of your book.The other half of the sheet becomes the first and last page of your book. These pages are typically printed with a solid color or a pattern, but can be a great place for information, like the maps found on the Tolkien series.
Hardcover books under 60 pages don’t typically use traditional endsheets. Instead, the first and last inside pages are glued to the hardcover case and the first and last pages of your book are part of the book body.
Hardcover books are also reinforced with fabric, known as the super. The super is glued to the spine during the binding process to strengthen the spine and prevent pages from tearing. In the image to the right you can see the fabric underneath the endsheet lining the spine for added strength.