These Ryman Card Envelopes are C5-sized, 120gsm and come in a pack of 25.These envelopes are made from high quality paper and feature a peel and seal closure making them easy to use and more hygienic than standard gummed envelopes. They can take a folded A4 letter or an A5 piece of paper as it is. They do not feature an obscuring pattern on the inside.These C5 Ryman Card Envelopes are less business looking than others making them ideal for sending cards and personal correspondence.