Prestige by Alvin vinyl art envelope print protectors are ideal for artists, architects, engineers, pilots, or anyone who needs to store and protect important artwork or documents. Protective print protectors are made from heavy-duty .10 mil vinyl, heat-sealed on 3 sides. Fourth side open with flap to hold work in place and protect against dust, dirt, moisture. First dimension (width) is open side. Each sheet protector includes an acid-free black paper insert. Designed to fit standard art size sheets and art portfolios. Dimensions shown below indicate content size. PACKS OF 6.