Description Hard Card Board Back Envelopes 120gsm – Printed with ‘Please Do Not Bend’ In Manilla Brown Perfect for posting important documents and paper work – good quality peel and seal envelope Available in sizes C3 – A3 457 x 324mm C4 – A4 324 x 229mm C5 – A5 229 x 162mm C6 – A6 162 x 114mm