Envelopes
5 Star Mail Machine Envelopes Window Gummed 90gsm C5 White [Pack of 500]
Biodegradable window film Colour: White Window 100x40mm, 25mm in, 64mm up PEFC certified Oversized for machine insertion
https://www.bizrate.co.uk/envelopes/5-star-mail-machine-envelopes-oid38498510924.html