Security envelopes are very convenient for mailinf invoices, important papers, confidential documents, cheques, samples, brochures, etc. The significant part about the envelope is that , they are manufactured with a flap, which has a hot melt, pressure sensitive & adhesive strip for a one time permanent closure. Once sealed, they cannot be opened again, unless torn. This feature ensures utmost safety of the documents inside the envelope. Features: Extra strong Moisture resistant Peel & seal (permanent closure) Easy to write on Serial numbered for record Pre printed to & from address panel Tear off receipt Option for window envelope Sequential bar coding