Smooth white All Board Envelopes, measuring 152mm x 305mm, they are considerably longer than they are wide. These board envelopes are made from premium grade 500 micron, 350gsm, GD2 fully coated chipboard. They contain a pre-folded flap which includes a peel and seal strip – sealing them securely is a quick and easy process. Use them to keep paper, card and slim items protected during transit. You can print onto their smooth coated surface, or stick self-adhesive labels which bond very well to it.