Smooth white All Board Envelopes, with dimensions 162mm x 229mm, which means they fit A5-sized documents. They are manufactured from premium grade 500 micron, 350gsm, GD2 fully coated chipboard. You can trust these board envelopes to keep paper, card and other thin items protected during transit. They contain a pre-folded flap with a peel and seal strip, so they are fast and simple to seal securely. Their coated surface bonds well with self-adhesive labels and you can print directly on to it.