4mm Corrugated plastic sheets: 14 x 22 :100% Virgin White Pad
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Coroplast Corrugated Plastic Sheets - Hollinger Metal Edge
12x18 4mm Corrugated Plastic Sheets 100 Pack White Waterproof Lightweight, Blank Boards Double Sided for Lawn Signs, Garage Sales and Real State. Various Sizes, Colors by WholesaleArtsFrames-com - Walmart.com
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Coroplast Plastic cardboard 0.157-in T x 24-in W x 36-in L Black Corrugated Plastic Sheet in the Polycarbonate & Acrylic Sheets department at Lowes.com