These Ryman Envelopes are DL sized, 90gsm and come in a pack of 25.These envelopes feature a peel and seal closure making them easy to use and more hygienic than standard gummed envelopes and are ideal for sending twice folded A4 documents. They 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 their size means they are the most commonly used everyday envelope, ideal for all sorts of purposes.