With our comprehensive range of office stationery, 5 Star has always been your watch word for office essentials. All of our traditional stationery and business machines fall under the 5 Star brand. Making it easy to find those everyday products every time. This envelope is Oversized for machine insertion. The window film is Biodegradable and its Trapeze style flaps aids insertion. These envelopes have a handy gummed closure for quick and easy fastening. They are wallet opening - meaning that they seal on their longer side.