They are also available with a first class green diamond border, which expedites postal handling. These envelopes are made from heavy duty Brown Kraft or Manila stock. When the flap is folded over, the adhesives stick together. When the paper is removed, the adhesive is activated. First Class Permit, indicia and return address preprinted on envelope.
Original sender pays postage.
To cut flush means to cut the top flap off the envelope. Center Seam, Diagonal Seams or Side Seams with the bottom flap. Diagonal Seams running from the bottom corners to near the center of the throat. Side Seams runs almost parallel to the side fold. A rectangular seal flap.