In the Middle Ages, animal skin was stretched over frames similar to these. Then it was scraped and treated to obtain fine thin, almost transparent sheets. After being removed from the frame, it was cut into sheets suitable for binding. Read more about it on my blog.
This is a small replica, with a personalized details of Your choice.
Select the desired ink color.
The letters You see are Gothic Textura Quadrata letters (12th-16th century), and if You want different ones, take a look in the Gallery of Scripts.