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Foam Core Backing Board 3/16" Black 1 Side Self Adhesive 18x24- 5 Pack. Many Sizes Available. Acid Free Buffered Craft Poster Board for Signs, Presentations, School, Office and Art Projects - Walmart.com
FOAM CORE 18 inches x 24 inches | 24 inches x 18 inches ( 3/16" Thick) - Graphic Impact - Signs, Banners, Engraving and Apparel
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Amazon.com : Elmer's Foam Board Multi-Pack, 18 x 24 Inches, 3/16 Inch Thickness, Black, 2 Pack : Office Products
18x24 Elmer's Foam Board
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Foamboard Posters Delivery Only - Office Depot
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Custom Foam Board Signs 24 x 18
3/16" Black 1 Side Self Adhesive Foam Core Boards :18X24