Prestige™ Alvin Art Envelope 23 X 36 - Pkg of 6These six envelopes will each provide your work with a protective covering that will keep it from being damaged by wear and tear and the elements. Each .010" heavy-duty envelope is made from clear vinyl that makes it easy to display your work. Three heat-sealed sides keep moisture and dirt out while a fourth side can be closed with a flap. Hand your work to others, carry it outdoors and pack it into a briefcase without worrying about damaging it. Use the acid-free black paper insert included with each envelope to create an aesthetically pleasing display for your work or take it out to display both the front and the back of the work.