The top of these files, however, is smooth glass and rather thin. Putting polymer on the handle section makes them much easier to hold and use. The files I use are in two sizes, as you can see in the photo. I used slices from canes and clay stacks to cover these pieces.
The five files in the picture below were covered using different sheets of translucent and metal leaf mokume gane. This gives them an rather elegant look. I did add an acrylic finish to the polymer on these files to help protect the metal leaf.
It's amazing what you can decorate with polymer, changing a simple object into something special and, in this case, making it easier to use.