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229 x 162 mm - ( C5 / A5 Size - 125 Envelopes / Box ). 324 x 229 mm - ( C4 / A4 Size - 125 Envelopes / Box ). 238 x 163 mm - ( C5+ / A5+ Size 125 Envelopes / Box ). 352 x 249 mm - ( C4+ / A4+ Size 125 Envelopes / Box ).

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C5 / A5 - 229mm x 162mm. C6 / A6 - 162mm x 114mm. C3 / A3 - 458mm x 324mm. C4 / A4 - 324mm x 229mm. HARD CARD BACKED PEEL AND SEAL RIGID ENVELOPES.

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Do Not Bend Envelopes C6, C5, C4, B4 & C3 Sizes Stocked

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BOARD BACKED ENVELOPES Hard Please do not bend C3 C4 C5 C6 Cheapest A3 A4 A5 A6 £1.56 - PicClick UK

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C6/A6 Hard Board Back Manilla Please Do Not Bend Envelopes. Delivery only to UK – StampsPhilately

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C6/A6 Hard Board Back Manilla Please Do Not Bend Envelopes. Delivery only to UK – StampsPhilately