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Cathedral Products Black 5mm Foamboard - A3 Size (297 x 420mm) - Pack of 10 : Amazon.co.uk: Stationery & Office Supplies
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Foam Core Backing Board 3/16" Black 12x24- 5 Pack. Many Sizes Available. Acid Free Buffered Craft Poster Board for Signs, Presentations, School, Office and Art Projects - Walmart.com
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