Ideal for artists, designers, architects, engineers, or anyone who needs to store and protect important artwork or documents. Made from heavy-duty .010" crystal-clear vinyl, heat sealed on three sides. Designed to fit standard art size sheets and portfolios. Fourth side opens with flap to hold artwork in place and protect against dust, dirt and moisture. Includes acid-free black paper insert. First dimension is opening edge. Packaged and sold by the dozen.