Thank you for viewing. ☆ This was made for a paperback size, but paperback sizes vary. Please be sure to check the book size before purchasing. It cannot be used for books with a height of 182mm. If you prefer the adjustment part in image 4 to be longer, please refrain from purchasing. Outer fabric: Cotton sheeting (with adhesive interlining) Lining: Cotton sheeting I make these as a hobby, finding fabrics I like. If you are concerned about imperfections such as warping, or if you are looking for perfection, please refrain from purchasing.