Tudor B4 Gold Pocket Envelopes 250 Pack These Tudor B4 Gold Pocket Envelopes are plain faced so that you can write on them or attach address labels. Each envelope has a side opening so that you can easily slide mail or cheques inside. Tudor B4 Plainface Envelopes 250 Pack These Tudor Plainface Envelopes are perfect for sending and storing your important documents. They are plainfaced so you can write on the front or affix your own address labels. They have a secure Peel-n-Seal closure which will ensure that the contents stay safely inside.