Quality Park photo document mailers are made of extra rigid fiberboard to protect your photos. Perfect for shipping & storage. Our photo envelopes have Redi-Strip self sealing closures for a fast, instant seal. The perfect mailroom update for concerns about surface germs in the workplace. Skip the yuck, stay safe & save time with every mailing. Seam Type: Side; Flap Type: Cheese Blade; Security Tinted: No; Opening: Open End.