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16 Pack A3 Foam Boards AHUNTTER White 5mm Thick Polystyrene Foam Core Sheets Large Styrofoam Board for Crafts (297 x 420mm) : Amazon.co.uk: Stationery & Office Supplies
FAATCOI 50 Pack Foam Core Backing Boards, 12 x 16 x 1/8 inch White Foam Boards, Thick Craft Poster Board for Signs, Presentations, School, Office and Art Projects: Amazon.co.uk: Stationery & Office Supplies
5mm White Foam-Core 70cm x 100cm
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3mm White Foam Core
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5mm 10mm White Foam Core Board Kt Board Paper Foam Board - China PS Foam Board, Paper Foam Board | Made-in-China.com