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Black Infinity Styrene Board - Pre-Cut Sizes (3/16") Multi-Packs
BAZIC Red Foam Board 20" X 30", Colored Foam Boards 3/16 Inch Thickness, 25-Pack - Walmart.com
Elmer's 3pk 16" X 20" Foam Presentation Boards - White : Target
Amazon.com : Excelsis Design 15 Pack Foam Board 8x10 Inches | White Foam Board 3/16 Inch Thick White Core Mat | Backing Board for Presentations, Signboards, Arts, Display and Crafts with Double-Sided