Hero Arts Magnetic Sheets & Storage Envelopes 4"X5" 10 pack - Small - This package of 10 magnetic sheets and 10 storage envelopes is from Hero Arts and is part of the Hero Tools Collection. This set is perfect for storing your coordinating stamps and dies. Each envelope is transparent, has a top closure, and is made of sturdy plastic that will last a long time. The magnetic sheet keeps your metal dies organised. The envelopes measures 4" x 5" with a 3.25" x 4.25" magnetic sheet inside. These are perfect for storing 3" x 4" stamp and die sets, cover plate dies, small embossing folders, and more. This is one more way to keep craft supplies organised and at your fingertips with the clear aspect of these quality storage envelopes.