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10x13 Elmer's Foam Board
Amazon.com: DNB Craft Foam Board - 3PCS 17X11X2 Inch Polystyrene Rectangle White Thick Foam Sheets - Crafts and Arts Supplies : Arts, Crafts & Sewing
Amazon.com : AKOLAFE 30 Pack 10x8 Inch Foam Boards, 5 mm Thick Foam Core Board 1/5 Inch White Foam Sheet, White Polystyrene Poster Board Signboard for Presentations, School, Office & Art Projects : Office Products
Amazon.com: MBC Mat Board Center, Pack of 10 Acid-Free Foam Boards, 11x14 inch White Foam Boards, 1/8" Thick : Office Products
Amazon.com: PVC Foam Board Sheet - 24" x 48" - White - 3mm Thickness - Used in Signboard/Display, Digital & Screen Printing, Crafts, Modeling, Photo Mounting, & Theatrical Props - Lightweight &
1 Inch Thick Foam Board Sheets - 6 Pack 17x11 Inch Polystyrene Rectangles for DIY Crafts, Insulation, Sculptures, Models (White) | Michaels