Foam board sheets contains polystyrene extruded foam that is laminated between two sheets of paper to form a lightweight but strong, rigid surface. They are ideal for crafts, school projects, framing, mounting, displays and exhibits. Easy-to-cut sheets have a smooth surface that can accept a wide range of media, including paints. Acid-free foam board is 3/16″ thick. Assorted pack contains five sheets of white and one sheet each of red, blue, black, green and yellow.