For storing larger stamp and die sets, you will need these Regular Magnet Sheets and Storage Envelopes from Hero Arts. These magnetic sheets and envelopes are part of the Hero Tools Collection. 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.