This is a handmade book cover. The size is for a shiroku-ban (approximately 135 x 195 mm) book. When unfolded, the vertical dimension (the part that actually holds the book) is about 20 cm, and the horizontal dimension is about 37 cm. ☆ It can be used for hardback shiroku-ban books. Please pay attention to the size of your book. As it is handmade, there may be some slight variations, but please understand. Shipping will be via regular mail (teikeigai-yubin). Please note that the post office is closed on Saturdays, Sundays, and holidays, so even if the item is shipped, it may take some time to arrive. Thank you for your understanding.