Thank you for viewing. This is a denim book cover for a B6-sized book. It can be used for books with a thickness of 1.5cm to 2.5cm. The denim is navy blue, and the lining is a black-based printed fabric. As this item is made of denim, color fading and color transfer may occur during use. This is a handmade item made by an amateur using a home sewing machine, so it may not be suitable for those who are particular about the stitching and finish. Please understand that this is a handmade item and purchase accordingly.