I have an enquiry. Security non-tearable envelope 4x9 size. There is a self adhesive tape to close the envelope. You can peel off the tape and close the envelope. When you try to open the closed envelope, the world "OPEN" will appear on the envelope. This will help you to know that the envelope has already been opened. Can you suggest something similar to this?
Union Envelopes, a company in Sitra
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