This is a book cover for a size similar to a B6 paperback. It's a common size for softcover books. This cover is 2cm wider when opened to accommodate thicker books, up to about 4cm. However, it may not fit as snugly on books around 2cm thick. For reference, the book used in the photos is 18.8cm tall, 13cm wide, and 3.7cm thick (573 pages) (see image 6). The front uses two types of Kurume-ori fabric. The back is made of dark green Kishu Hosofu fabric. Interfacing is applied. Height: Approximately 20cm Width: Approximately 37cm when opened No bookmark string is included. Although carefully made, this is a handmade item. Thank you for understanding. I hope it will be used daily by those who don't mind minor imperfections.