These envelopes are transparent, have a top closure and are made from sturdy plastic that will last a long time. This package includes 10 high quality plastic envelopes that measure 5" x 7". The included magnetic sheet measures 4.25" x 6.25. These sheets and envelopes are the perfect size for storing all your 4" x 6" stamp and die sets and larger stand-alone dies. These envelopes and magnetic sheets will start you on your way to organizing all your stamps and dies so you won't misplace part of the set.