Each book measures approximately 3 3/4" tall x 3 1/2" wide, and 5/8" deep. There are 5 pages in each book and each page will hold 2 photos which can be slid into place from the top (the slot measures approximately 3 1/4" x 3 1/4"). The photo display area measurues 2" in diameter.  You can use these to hold Fujifilm Instax prints. Each book is held closed by tying the strings into a bow. The strings do have some red on them please see photos.