4 1/2 x 6" Orange "Important Papers Enclosed" Envelopes. Pressure sensitive envelopes secure and protect documents that are attached to the outside of shipments. Pre-printed with "Invoice Enclosed", "Important Papers" and "Do Not Destroy" warnings. Hot melt adhesive backing provides strong adhesion to paper and corrugated products. Envelopes open along the first dimension. 1000 per case.