STURDY - Made of high-density polyethylene, the document holders are resistant to rain and shock, so we will make our documentation completely safe. The back of our document holders contains a super strong adhesive that will allow you to stick them onto any container for shipments such as cardboard boxes, plastic bags, pallets or wooden trunks. Confidential content: With the tamper-proof secure closure we will keep our important notes, invoices or documents confidentially until arrival to the recipients. Secure documents: It will allow the recipient to receive the documentation in perfect condition, so it will be completely secure and protected inside our document envelopes. Our document holder envelopes have an inner measurement of 155x105mm. This measurement is perfect for A6 documents.