Hero Tools Small Magnet Sheets & Storage Envelopes (10)The perfect way to store your stamps and dies. The transparent plastic envelope has a top closure, made with sturdy construction and is long lasting. The magnetic sheet keeps your metal dies securely organized. Includes ten 4? x 5? envelopes, each with a 3. 25? x 4. 25? magnetic sheets inside. Ideal for storing 3? x 4? clear stamp sets with coordinating dies, or smaller dies on their own.