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C6 Manilla Board Envelopes are the correct size for sending A6 paper, card, and other documents. These manilla board envelopes are printed with “Please Do Not Bend” to ensure your package arrives in a neat and presentable condition. Their rigid 1000 micron back board combined with a 120gsm manilla paper front keeps your items secure and postage costs down. They feature a handy peel and seal adhesive strip to keep packing time to a minimum and eliminate the need for tape.