PremierTeam wallet envelopes in size DL have a peel and stick opening flap on the long side. white envelopes. White DL envelopes from PremierTeam measure 110 mm x 220 mm (4.25 x 8.5) and are made from a quality 120gsm white paper to give you a professional look for every letter or mailing that you send. These plain envelopes are solid for sending private documents without seeing the interior contents. The envelopes are security printed on the interior to protect confidential details. The peel-and-stick seal is the strongest type of envelope seal with the longest shelf life; peel away the protective tape to reveal the adhesive, no moisture required.