They are the exact size of my dvd cases (5" x 7.25"). You can definitely put clear or unmounted rubber on both sides. You can put cling-mounted rubber on both sides, too...but it will be a little squishy (but it shouldn't hurt good quality rubber)
The cases are "sheer" not totally clear, and you can make a paper label if you want and slide it into the holder on the outside to show the stamped images.
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