International standard envelopes for paper or documents C6, C5, DL, C4. Templates of bending brochures, booklets, leaflets of A format for envelopes. Stock Vector | Adobe Stock
Paper size - Wikipedia
Standard C6 Envelope Template 4.5 X 6.4 Envelope Template - Etsy
Envelopes DIN C6 114 x 162 mm without Window C6 with Wet Seal for Invitations A6 Greeting Cards for Weddings Birthday in Burgundy (Pack of 50) : Amazon.com.be: Office Products