This is a single cover, which you can use to give your newly-embossed Braille book a finished, professional look. Each cover is precision cut to just a bit larger than the Braille paper you printed the book with, so it doesn't leave any exposed edges. The cover is punched with the same 19-hole, GBC style as the paper, so it fits just where it should when you place the pages in the spine. Finally, the cover is 23-thousandths of an inch thick, but Braille can still be punched into it to denote the book's title with a Perkins Brailler, if you wish.
(From the Writing Braille shelf.)