JAM Paper Smoke Grey Index Sized Plastic Booklet Envelope with Button and String Tie Closure is the perfect size for 5" x 7" inch index cards! Use them to store your notes for that upcoming exam, for recipes at home, for memos at work, or for any small document or note card purpose! Each one is made of pliable, yet durable plastic, has a straight flap opening, and features an easy to use two button string tie closure. These envelopes are sure to keep all of your small documents and not cards neat, orderly, and safe from damage. This pack includes 12 envelopes. Keep those small, but important notes in a secure and easy to carry place with this neutral grey envelope!.Closure: Button & string.12 per pack.Expansion: 1.25".Size: 5 1/4" x 7 1/2".Material: Plastic.Opening: Booklet.JAM Paper 5 1/2" x 7 1/2" Index booklet smoke gray button and string plastic envelope in a pack of 12 is expandable up to 1" and allows you to keep your documents safely.