This is a sheet of UNMOUNTED rubber that you can trim and mount yourself. I designed the alphabet and umbrellas to use in an animated film called Random Thoughts. Umbrellas are a theme throughout the short, hand drawn film. To mount the alphabet, I bought a package of 3/8 inch wide craft sticks (like small popsicle sticks). Another way would be to use 3/8 inch square pegs, if you can find those at a craft store.
The die is deeply etched natural red vulcanized rubber.