This is a set of bone folders: one with sharp edges and one with slightly rounded over edges. When I lost my previous bone folder in a move, I didn't feel the need to buy a new one for 10 bucks. For those of you who are unfamiliar, a bone folder is simply a bone or plastic tool designed to allow one to make sharp folds and creases in paper while minimizing finger fatigue, often used in book binding and origami due to the large amount of paper folding in both of these crafts. In addition to .stl files for both folders, the download includes the Autodesk Inventor .ipt files needed to edit the models should anyone choose to do so (I welcome you to make them suit your needs!).