Clairefontaine intense red coloured envelopes made of 120g paper are sold in a pack of 5. These smooth, flat envelopes are suitable for printing on an inkjet or laser printer. The intense red envelopes measure 16.3cm x 22.9cm (C5). Thanks to the self-adhesive closing method, the contents remain safe in the envelope. The 100% acid-free paper is produced according to high environmental standards.