1000 A6 C6 158mm x 120mm Self Adhesive Printed Documents Enclosed Wallets Manufactured from Printed Polythene, Internal Dimensions 158mm (width) x 120mm (height). A6 / C6 Document Size. Strong Adhesive Backing. These Documents Enclosed Labels are designed to attach invoices and dispatch notices onto packages and cartons. Manufactured from strong Polythene and featuring a peel able backing with strong adhesive that ensures that any enclosed documents remain with the attached package through the postal system and are protected from dirt, dust and moisture.