Ideal for artists, architects, engineers, pilots 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. Fourth side open with flap to hold work in place and protect against dust, dirt and moisture. First dimension (width) is open side. Includes an acid-free black paper insert. Designed to fit standard art size sheets and portfolios. Packaged and sold by the dozen.