324mm x 457mm C3 White Board Backed Envelopes (50)
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Measuring 324mm wide by 457mm long these white C3 board backed envelopes are classified as 'Medium Parcel' sized by Royal Mail. Perfect for sending documents that must stay flat, these board backed envelopes are made from high quality 120gsm white paper and backed with a 600gsm grey board. Please note this envelope is not printed 'Please do not Bend'.