Smooth white All Board Envelopes, measuring 178mm x 241mm & made from premium grade 500 micron, 350gsm, GD2 fully coated chipboard. The envelopes have a pre-folded closure containing a peel & seal strip so they are fast & simple to seal securely. You’ll find they’re perfect to keep paper, card & slim items protected during transit & because their surface is smooth, self-adhesive labels bond well to it & you can print directly on to it.