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Amazon.com: Corrugated Plastic 24" x 48" 4mm White Blank Sign Sheets Coroplast Intepro : Industrial & Scientific
Amazon.com : Corrugated Plastic Sheet for Indoor and Outdoor Use - 4 Mm Thick Poster Board, 24x36 Inches - Pack of 2 White Plastic Board Sheets - Waterproof Coroplast Sheets and Lightweight