This is a cover for a pocket notebook that is compatible with Levenger Circa system.Levenger and Circa are trademarks of the Levenger Company (http://levenger.com).On the photo (left to right): a new cover with protective coating, a cover with blue leather glued around it, a cover with protective coating taken off, a full notebook made from 2 of those covers, some linen, and leather. This notebook has seen over a year of hard use in the front pocket of my jeans, which gave it a nice weathered feel.You can cut it out of 1mm transparent PET, which is durable enough for light-duty use (my wife's purse). For heavy duty use (my jeans front pocket) I recommend mixing this design with genuine leather.