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24x36 4mm Corrugated Plastic Sheets 10 Pack Red Waterproof Lightweight, Blank Boards Double Sided for Lawn Signs, Garage Sales and Real State. Various Sizes, Colors by WholesaleArtsFrames-com - Walmart.com
Amazon.com: Performore Expanded PVC Sheet – Lightweight Rigid Foam – 6mm (1/4 inch) – 12 x 12 inches – White – Ideal for Signage, Displays, and Digital/Screen Printing, Non-Porous : Industrial & Scientific
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12x18 4mm Corrugated Plastic Sheets 100 Pack Yellow Waterproof Lightweight, Blank Boards Double Sided for Lawn Signs, Garage Sales and Real State. Various Sizes, Colors by WholesaleArtsFrames-com - Walmart.com