These pockets seal at end and remove easily from desk. Self-adhesive and heavy duty. Open pocket, slip in document, remove backing, position pocket and stick! Great for documents, artwork, large photos, and signs. Pocket fits 9" x 12" document. Each pocket measures 9" tall by 12" wide. Each pack includes 12 pockets. Sold as 3 packs for a total of 36 pockets.