C3 A3 C4 A4 C5 A5 C6 A6 Hard Board Backed Envelopes Please Do Not Bend ALL SIZES

C4 Board Back Envelopes - 324x229mm. C5 Board Back Envelopes - 229x162mm. C6 Board Back Envelopes - 162x114mm. C3 Board Back Envelopes - 457x324mm.

eBay