C4 board backed envelopes are 115gsm heavy-duty manilla envelopes with hot melt glue on all seams, and finger lift silicon paper strips. These C4 board envelopes are perfect for posting larger sized A4 documents by adding that extra protection of a 550gsm Grey board back. These board backed C4 envelopes have 'Please do not bend' printed in red on the front of the envelope.
Size: 324 X 229 mm
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