Amazon.com : Mat Board Center, 25 pack 11x17 Brown Cardboard sheet, 1/8 inch thick, Flat Corrugated Cardboard Inserts for Packing, Shipping, Mailing, Cardboard Backing, Art Craft Card Board : Office Products
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Backing Boards
Backing & display board | Cardboard for bookbinding
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Mat Board Center, 25 pack 8.5x11 Brown Cardboard sheet, 1/8 inch thick, Flat Corrugated Cardboard Inserts for Packing, Shipping, Mailing, Cardboard Backing, Art Craft Card Board - Yahoo Shopping
50 Sheets Chipboard 9 x 12 inch - 30pt (point) Medium Weight Brown Kra — MagicWater Supply
8.5 X 11 Chipboard Sheets Pads Cardboard for Photos Backing Boards Crafts Shirt FREE SHIPPING - Etsy
White Cardboard Hard Cardboard | Cow Cardboard Backing Board | Cardboard A4 Cardboard - Cards & Card Stock - Aliexpress
White Faced Cardboard mat and frame backing
Hard 1mm Smooth Black 72 X 102cm Backing Board For Photo Frame