PremierTeam white wallet envelopes with window in DL size (110 mm x 220 mm) have a peel and stick opening flap on the long side. DL white envelopes with window from PremierTeam measure 110 mm x 220 mm or 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 windowed envelopes feature a standard size window to see the address. 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. PremierTeam envelopes.