Keep signs and other important messages looking neat and professional. Closed on three sides. Two strips of removable adhesive on back securely mount your document to walls, chalkboards, etc.?no need for extra tape. Protector removes cleanly without damaging surfaces. Polypropylene. Archival safe and acid-free; won't lift print. Load Orientation: Top; Sheet Capacity: 20; Sheet Protector Type: Display; Insert Size: 8 1/2 x 11.