You are buying a pattern to make your own book fold. You will need a book that is at least 21cm and has a minimum of 438 pages. Please note you are not permitted to sell or share this pattern but you may sell the completed fold. Please credit me when displaying pictures of the completed fold. The finished fold will depend upon your folding style, I recommend that you trim the excess off the folds to avoid 'bulging' in the pattern. Feel free to contact me if you need any help of if you require a custom pattern.