These Ryman Envelopes have a window, are DL sized, 90gsm and come in a pack of 1000.These envelopes feature a window panel allowing the enclosed document to display the name and address.They have a peel and seal closure making them easy to use and more hygienic than standard gummed envelopes and are ideal for sending DL documents as well as sending folded A4 documents. These Ryman Envelopes have a blue obscuring pattern inside so that the contents does not appear visible from the outside and would be classed as a small letter when it comes to postal charges.These DL Ryman Envelopes are a must have for any office, school or university as they not only look professional but the window rules out sending the wrong letter to the wrong address and saves you time in the process.