slices of assortment of 1/2 to 2 mm thick leather. Various colors random lots. Personally they me hide things like the back with a clasp. Second picture an example of use, to protect phone screen from the metallic snap (washer placed in the manufacture of this case 3 years ago) I also glue (0 customer demand) on the metal parts of the clasps on the skin, avoiding the discomfort of an allergic reaction to metal I have a large inventory, so why not see if they can be useful to someone. There are no existing category for this item is why some is chosen at random.