Smooth white, square All Board Envelopes, measuring 340mm x 340mm are perfect for sending 12 inch records. Manufactured from premium grade 500 micron, 350gsm, GD2 fully coated chipboard, these are high quality and sturdy, board envelopes that you can trust and have a built in pre-folding closing flap, with peel and seal strip, to make these record mailers a time-saving option that will help speed up despatch. They’re easy to use and to add addresses you can stick a self-adhesive label to their smooth surface.