5 1/2 inch x 10 inch Packing list/Cert of compliance/Cert. Of analysis enclosed" envelopes. Pressure sensitive envelopes secure and protect documents that are attached to the outside of shipments. Pre-printed with inch Packing list/Certificate of compliance/Certificate of analysis enclosed" on heavy 2 mil poly. Hot melt adhesive backing provides strong adhesion to paper and corrugated products. Envelopes open along the first dimension. 1000 per case.