Amazon.com: Mat Board Center, Pack of 10, 11x14 Self Adhesive Foam Board for Picture and Poster Mounting, Lightweight White Color Foam Board for Crafts, Artworks, School Projects, 3/16 inches Thick : Office Products
Amazon.com : Excelsis Design 15 Pack Foam Board 11x14 Inches | Black Foam Board 3/16 Inch Thick Black Core Mat | Backing Board for Presentations, Signboards, Arts, Display and Crafts with Double-Sided